1. B. Wu, Y. Zhou, G. Xing, Q. Xu, H. F. Garces, A. Solanki, T. W. Goh, N. P. Padture*, T. C. Sum*, "Long Minority‐Carrier Diffusion Length and Low Surface‐Recombination Velocity in Inorganic Lead‐Free CsSnI₃ Perovskite Crystal for Solar Cells", Advanced Functional Materials (2017) - published online - DOI: 10.1002/adfm.201604818 - pdf
2. J. Chen, X. Zhao, S. J. R. Tan, H. Xu, B. Wu, B. Liu, D. Fu, W. Fu, D. Geng, Y. Liu, W. Liu, W. Tang, L. Li, W. Zhou, T. C. Sum, K. P. Loh*, "Chemical Vapor Deposition of Large-size Monolayer MoSe2 Crystals on Molten Glass", Journal of the American Chemical Society (2017) - published online - pdf

1. W. R. Leow, W. K. H. Ng, T. Peng, X. Liu, B. Li, W. Shi, Y. Lum, X. Wang, X. Lang, S. Li, N. Mathews, J. W. Ager, T. C. Sum, H. Hirao*, and X. Chen*, "Al₂O₃ Surface Complexation for Photocatalytic Organic Transformations", Journal of the American Chemical Society (2016) - published online
2. A. Priyadarshi, L. J. Haur, P. Murray, D. Fu, S. Kulkarni, G. Xing, T. C. Sum, N. Mathews*, and S. G. Mhaisalkar*, "A large area (70 cm²) monolithic perovskite solar module with a high efficiency and stability", Energy & Environmental Science 9 3687-3692 (2016) - pdf
3. A. Perumal, S. Shendre, M. Li, Y. K. E. Tay, V. K. Sharma, S. Chen, Z. Wei, Q. Liu, Y. Gao, P. J. S. Buenconsejo, S. T. Tan, C. L. Gan, Q. Xiong, T. C. Sum, and H. V. Demir*, "High brightness formamidinium lead bromide perovskite nanocrystal light emitting devices", Scientific Reports 6 36733 (2016) - pdf
4. X. Zhao, J. Feng, S. Chen, Yizhong Huang, T. C. Sum, and Z. Chen*, "New insight into the roles of oxygen vacancy in hematite for solar water splitting", Physical Chemistry Chemical Physics (2016) - published online
5. B. Wu, N. Mathews, T. C. Sum, "Plasmonic Organic Solar Cells: Charge Generation and Recombination", Singapore: Springer Nature (2017). Print.
6. A. Solanki, A. Bagui, G. Long, B. Wu, T. Salim, Y. Chen, Y. M. Lam, and T. C. Sum*, "Effectiveness of External Electric Field Treatment of Conjugated Polymers in Bulk-heterojunction Solar Cells", ACS Applied Materials & Interfaces 8 32282-32291 (2016) - DOI: 10.1021/acsami.6b08012 - pdf
7. G. Long, B. Wu, A. Solanki, X. Yang, B. Kan, X. Liu, D. Wu, Z. Xu, W.‐R. Wu, U Jeng, J. Lin, M. Li, Y. Wang, X. Wan, T. C. Sum*, and Y Chen*, "New Insights into the Correlation between Morphology, Excited State Dynamics, and Device Performance of Small Molecule Organic Solar Cells", Advanced Energy Materials 6 1600961 (2016) - DOI: 10.1002/aenm.201600961 - pdf
8. G. Xing, M. H. Kumar, W. K. Chong, X. Liu, Y. Cai, H. Ding, M. Asta, M. Grätzel, S. Mhaisalkar, N. Mathews*, T. C. Sum*, "Solution‐Processed Tin‐Based Perovskite for Near‐Infrared Lasing", Advanced Materials 28 8191-8196 (2016) - DOI: 10.1002/adma.201601418 - pdf
9. Y. Gao, G. Yu, Y. Wang, C. Dang, T. C. Sum, H. Sun*, and H. V. Demir*, "Green Stimulated Emission Boosted by Nonradiative Resonant Energy Transfer from Blue Quantum Dots", The Journal of Physical Chemistry Letters 7 2772-2778 (2016) - pdf
10. Q. Zhang, R. Su, X. Liu, J. Xing, T. C. Sum*, and Q. Xiong*, "High‐Quality Whispering‐Gallery‐Mode Lasing from Cesium Lead Halide Perovskite Nanoplatelets", Advanced Functional Materials 26 6238-6245 (2016) - DOI: 10.1002/adfm.201601690 - pdf
11. D. Giovanni, W. K. Chong, H. A. Dewi, K. Thirumal, I. Neogi, R. Ramesh, S. Mhaisalkar, N. Mathews*, and T. C. Sum*, "Tunable room-temperature spin-selective optical Stark effect in solution-processed layered halide perovskites", Science Advances 2 e1600477 (2016) - DOI: 10.1126/sciadv.1600477 - pdf
12. S. S. Lim, W. K. Chong, A. Solanki, H. A. Dewi, S. G. Mhaisalkar, N. Mathews*, and T. C. Sum*, "Modulating Carrier Dynamics through Perovskite Film Engineering", Physical Chemistry Chemical Physics 18 27119-27123 (2016) - DOI: 10.1039/C6CP02640K - pdf
13. Z. Ku, N. H. Tiep, B. Wu, T. C. Sum, D. Fichou, and H. J. Fan*, "Solvent engineering for fast growth of centimetric high-quality CH₃NH₃PbI₃ perovskite single crystal", New Journal of Chemistry 40 7261-7264 (2016) - pdf
14. B. Peng, G. Yu, Y. Zhao, Q. Xu, G. Xing, X. Liu, D. Fu, B. Liu, J. R. S. Tan, W. Tang, H. Lu, J. Xie, L. Deng, T. C. Sum* and K. P. Loh*, "Achieving Ultrafast Hole Transfer at the Monolayer MoS₂ and CH₃NH₃PbI₃ Perovskite Interface by Defect Engineering", ACS Nano 10 6383-6391 (2016) - DOI: 10.1021/acsnano.6b02845 - pdf
15. X. Liu*, L. Niu, C. Wu, C. Cong, H. Wang, Q. Zeng, H. He, Q. Fu, W. Fu, T. Yu, C. Jin, Z. Liu*, T. C. Sum*, "Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing", Advanced Science 3 1600137 (2016) - DOI: 10.1002/advs.201600137 - pdf
16. B. Wu, H. T. Nguyen, Z. Ku, G. Han, D. Giovanni, N. Mathews, H. J. Fan, and T. C. Sum*, "Discerning the Surface and Bulk Recombination Kinetics of Organic–Inorganic Halide Perovskite Single Crystals", Advanced Energy Materials6 1600551 (2016) - DOI: 10.1002/aenm.201600551 - pdf
17. S. A. Veldhuis, P. P. Boix*, N. Yantara, M. Li, T. C. Sum, N. Mathews, and S. G. Mhaisalkar*, "Perovskite Materials for Light‐Emitting Diodes and Lasers (Review)", Advanced Materials 28 6804–6834 (2016) - pdf
18. Z. Chen, J. Wang, D. Chao, T. Baikie, L. Bai, S. Chen, Y. Zhao, T. C. Sum, J. Lin*, and Z. Shen*, "Hierarchical Porous LiNi_1/3Co_1/3Mn_1/3O₂ Nano-/Micro Spherical Cathode Material: Minimized Cation Mixing and Improved Li⁺ Mobility for Enhanced Electrochemical Performance", Scientific Reports 6 25771 (2016) - pdf
19. L. He*, T. E. Wood, B. Wu, Y. Dong, L. B. Hoch, L. M. Reyes, D. Wang, C. Kubel, C. Qian, J. Jia, K. Liao, P. G. O'Brien, A. Sandhel, J. Y. Y. Loh, P. Szymanski, N. P. Kherani, T. C. Sum, Charles A. Mims, and G. A. Ozin*, "Spatial Separation of Charge Carriers in In₂O_3-x(OH)_y Nanocrystal Superstructures for Enhanced Gas-Phase Photocatalytic Activity", ACS Nano 10 5578-5586 (2016) - pdf
20. B. Peng, G. Yu, X. Liu, B. Liu, X. Liang, L. Bi, L. Deng, T. C. Sum*, and K. P. Loh*, "Ultrafast charge transfer in MoS₂/WSe₂ p-n Heterojunction", 2D Materials 3 025020 (2016) - DOI: 10.1088/2053-1583/3/2/025020 - pdf
21. Y. Li*, X. Wei, B. Zhu, H. Wang, Y. Tang, T. C. Sum, and X. Chen*, "Hierarchically branched Fe₂O₃@TiO₂ nanorod arrays for photoelectrochemical water splitting: facile synthesis and enhanced photoelectrochemical performance", Nanoscale 8 11284-11290 (2016) - pdf
22. W. K. Chong, K. Thirumal, D. Giovanni, T. W. Goh, X. Liu, N. Mathews, S. Mhaisalkar, and T. C. Sum*, "Dominant factors limiting the optical gain in layered two-dimensional halide perovskite thin films", Physical Chemistry Chemical Physics 18 14701-14708 (2016) - DOI: 10.1039/C6CP01955B - pdf
23. S. Bhaumik, S. A. Veldhuis, Y. F. Ng, M. Li, S. K. Muduli, T. C. Sum, B. Damodaran, S. Mhaisalkar, and N. Mathews*, "Highly stable, luminescent core–shell type methylammonium–octylammonium lead bromide layered perovskite nanoparticles", Chemical Communications 52 7118-7121 (2016) - pdf
24. Y. Zhang, B. Wu, Y. Tang, D. Qi, N. Wang, X. Wang, X. Ma, T. C. Sum*, and X. Chen, "Prolonged Electron Lifetime in Ordered TiO₂ Mesophyll Cell-Like Microspheres for Efficient Photocatalytic Water Reduction and Oxidation", Small 12 2291-2299 (2016) - DOI: 10.1002/smll.201503611 - pdf
25. S. Chen, K. Roh, J. Lee, W. K. Chong, Y. Lu, N. Mathews, T. C. Sum and A. Nurmikko*, "A Photonic Crystal Laser from Solution Based Organo-Lead Iodide Perovskite Thin Films", ACS Nano 10 3959-3967 (2016) - pdf
26. S. Shukla, G. Xing, H. Ge, R. R. Prabhakar, S. Mathew, Z. Su, V. Nalla, T. Venkatesan, N. Mathews, T. Sritharan, T. C. Sum*, and Q. Xiong, "Origin of Photocarrier Losses in Iron Pyrite (FeS₂) Nanocubes", ACS Nano 10 4431-4440 (2016) - DOI: 10.1021/acsnano.6b00065 - pdf
27. T. C. Sum*, N. Mathews, G. Xing, S. S. Lim, W. K. Chong, D. Giovanni, and H. A. Dewi, "Spectral Features and Charge Dynamics of Lead Halide Perovskites: Origins and Interpretations", Accounts of Chemical Research 49 294-302 (2016) - DOI: 10.1021/acs.accounts.5b00433 - pdf

1. Y. Wang, B. Wu, C. Yang, M. Liu, T. C. Sum* and K.‐T. Yong*, "Synthesis and Characterization of Mn: ZnSe/ZnS/ZnMnS Sandwiched QDs for Multimodal Imaging and Theranostic Applications", Small 12 534-546 (2015) - DOI: 10.1002/smll.201503352 - pdf
2. Z. Li, P. P. Boix, G. Xing, K. Fu, S. A. Kulkarni, S. K. Batabyal, W. Xu, A. Cao, T. C. Sum, N. Mathews and L. H. Wong*, "Carbon nanotubes as an efficient hole collector for high voltage methylammonium lead bromide perovskite solar cells", Nanoscale 8 6352-6360 (2015) - pdf
3. Q. Zhang, X. Liu, M. Utama, G. Xing, T. C. Sum* and Q. Xiong*, "Phonon‐Assisted Anti‐Stokes Lasing in ZnTe Nanoribbons", Advanced Materials 28 276-283 (2015) - DOI: 10.1002/adma.201502154 - pdf
4. L. Niu, X. Liu, C. Cong, C. Wu, D. Wu, T. R. Chang, H. Wang, Q. Zeng, J. Zhou, X. Wang, W. Fu, P. Yu, Q. Fu, S. Najmaei, Z. Zhang, B. I. Yakobson, B. K. Tay, W. Zhou, H. T. Jeng, H. Lin, T. C. Sum, C. Jin, H. He*, T. Yu* andZ. Liu*, "Controlled Synthesis of Organic/Inorganic van der Waals Solid for Tunable Light–Matter Interactions", Advanced Materials 27 7800-7808 (2015) - pdf
5. S. Wang, Y. Zhang, J. Xing, X. Liu, H. Yu*, A. D. Lieto, M. Tonelli, T. C. Sum, H. Zhang* and Q. Xiong*, "Nonlinear optical response of Au nanorods for broadband pulse modulation in bulk visible lasers", Applied Physics Letters 107 161103 (2015) - pdf
6. H. Jin, S. Choi, G. Xing, J.-H. Lee, Y. Kwon, W. K. Chong, T. C. Sum, H. M. Jang and S. Kim*, "SnS₄^4-, SbS₄^3-, and AsS₃^3- Metal Chalcogenide Surface Ligands: Couplings to Quantum Dots, Electron Transfers, and All-Inorganic Multilayered Quantum Dot Sensitized Solar Cells", Journal of the American Chemical Society 137 43 13827-13835 (2015) - pdf
7. G. Long, B. Wu, X. Yang, B. Kan, Y. Zhou, L. Chen, X. Wan, H. Zhang, T. C. Sum*, and Y. Chen*, "The Enhancement of Performance and Mechanism Studies of All-solution Processed Small-Molecule based Solar Cells with an Inverted Structure", ACS Applied Materials & Interfaces 7 21245-21253 (2015) - DOI: 10.1021/acsami.5b05317 - pdf
8. A. Solanki, B. Wu, T. Salim, Y. M. Lam, and T. C. Sum*, "Correlation between blend morphology and recombination dynamics in additives-added P3HT:PCBM solar cells", Physical Chemistry Chemical Physics, 17 26111 (2015) - DOI: 10.1039/C5CP03762J - pdf
9. D. Giovanni, G. Yu, G. Xing, M. L. Leek*, and T. C. Sum*, "Measurement of sub-10 fs Auger processes in monolayer graphene" Optics Express 23 21107-21117(2015) - DOI: 10.1364/OE.23.021107 - pdf
10. T. C. Sum*, S. Chen, G. Xing, X. Liu and B. Wu, "Energetics and Dynamics in Organic-Inorganic Halide Perovskite Photovoltaics and Light Emitters (Invited Topical Review)", Nanotechnology26 342001 (2015) - DOI: 10.1088/0957-4484/26/34/342001 - pdf
11. B. Wu, K. Fu, N. Yantara, G. Xing, S. Sun, T. C. Sum* and N. Mathews*, "Charge Accumulation and Hysteresis in Perovskite-Based Solar Cells: An Electro-Optical Analysis" Advanced Energy Materials5 1500829 (2015) - DOI: 10.1002/aenm.201500829 - pdf
12. Q. Tay, P. Kanhere, C. F. Ng, S. Chen, S. Chakraborty, A. C. H. Huan, T. C. Sum, R. Ahuja and Z. Chen, "Defect Engineered g-C3N4 for Efficient Visible Light Photocatalytic Hydrogen Production" Chemistry of Materials 27 4930-4933 (2015) - DOI: 10.1021/acs.chemmater.5b02344 - pdf
13. J. Xing, X. Liu, Q. Zhang, S. T. Ha, Y. W. Yuan, C. Shen, T. C. Sum, and Q. Xiong, "Vapor Phase Synthesis of Organometal Halide Perovskite Nanowires for Tunable Room-Temperature Nanolasers" Nano Letters 15 4571-4577 (2015) - DOI: 10.1021/acs.nanolett.5b01166 - pdf
14. G. Li, X. Liu, X. Wang, Y. Yuan, T. C. Sum, and Q. Xiong, "Purified plasmonic lasing with strong polarization selectivity by reflection" Optics Express 23 15657-15669 (2015) - DOI: 10.1364/OE.23.015657 - pdf
15. J. Du, B. Zhu, W. R. Leow, S. Chen, T. C. Sum, X. Peng, and X. Chen*, "Colorimetric Detection of Creatinine Based on Plasmonic Nanoparticles via Synergistic Coordination Chemistry", Small 11 4104-4110 (2015) - DOI: 10.1002/smll.201403369 - pdf
16. X. Liu, Q. Zhang, W. K. Chong, J. N. Yip, X. Wen, Z. Li, F. Wei, G. Yu, Q. Xiong and T. C. Sum*, "Cooperative Enhancement of Second-Harmonic Generation from a Single CdS Nanobelt-Hybrid Plasmonic Structure" ACS Nano 9 5018-5026 (2015) - DOI: 10.1021/nn5072045 - pdf
17. X. Wang, C. Liow, A. Bisht, X. Liu, T. C. Sum*, X. Chen* and S. Li*, "Engineering Interfacial Photo‐Induced Charge Transfer Based on Nanobamboo Array Architecture for Efficient Solar‐to‐Chemical Energy Conversion", Advanced Materials 27 2207-2214 (2015) - DOI: 10.1002/adma.201405674 - pdf
18. G. Xing, B. Wu, S. Chen, J. Chua, N. Yantara, S. Mhaisalkar, N. Mathews and T. C. Sum*, "Interfacial Electron Transfer Barrier at Compact TiO₂/CH₃NH₃PbI₃ Heterojunction" Small11 3606-3613 (2015) - DOI: 10.1002/smll.201403719 - pdf
19. D. Giovanni, H. Ma, J. Chua, M. Graetzel, R. Ramesh, S. Mhaisalkar, N. Mathews and T. C. Sum*, "Highly spin-polarized carrier dynamics and ultralarge photoinduced magnetization in CH₃NH₃PbI₃ perovskite thin films" Nanoletters15 1553-1558 (2015) - DOI:10.1021/nl5039314 - pdf
20. F. Yan, G. Xing, R. Chen, H.V. Demir, H. Sun, T. C. Sum and X.W. Sun*, "Efficient three-color white organic light-emitting diodes with a spaced multilayer emitting structure", Applied Physics Letters 106 023302 (2015) - DOI:10.1063/1.4905599 - pdf
21. X. Liu, S. T. Ha, Q. Zhang, M. de la Mata, C. Magen, J. Arbiol, T. C. Sum*, Q. Xiong*, "Whispering Gallery Mode Lasing from Hexagonal Shaped Layered Lead Iodide Crystals" ACSNano9 687-695 (2015) - DOI: 10.1021/nn5061207 - pdf

1. Q. Zhang, G. Li, X. Liu, F. Qian, T. C. Sum, C. M. Lieber* and Q. Xiong*, "A Room Temperature Low-threshold Ultraviolet Plasmonic Nanolaser", Nature Communications 5:4953 (DOI:10.1038/ncomms5953) (2014) - pdf
2. X. Liu, B. Wu, Q. Zhang, J. N. Yip, G. Yu, Q. Xiong, N. Mathews* and T. C. Sum*, "Elucidating the Localized Plasmonic Enhancement Effects from a Single Ag Nanowire in Organic Solar Cells" ACSNano8 10101-10110 (2014) - DOI:10.1021/nn505020e - pdf
3. Q. Zhang, S. T. Ha, X. Liu, T. C. Sum* and Q. Xiong*, "Room-Temperature Near-Infrared High-Q Perovskite Whispering-Gallery Planar Nanolasers" Nanoletters14 5995-6001 (2014) - DOI: 10.1021/nl503057g - pdf
4. S. Chen, T. W. Goh, D. Sabba, J. Chua, N. Mathews, C. H. A. Huan* and T. C. Sum*, "Energy Level Alignment at the Methylammonium Lead Iodide/ Copper Phthalocyanine Interface (Invited Paper)", APL Materials2 081512 (2014) - DOI:10.1063/1.4889844 - pdf
5. W. K. Chong, G. C. Xing, Y. Liu, E. L. Gui, Q. Zhang, Q. Xiong, N. Mathews, C. K. Gan* and T. C. Sum*, "Direct Measurement of Coherent Phonon Dynamics in Solution-processed Stibnite Thin Films", Physical Review B90 035208 (2014) - DOI:10.1103/PhysRevB.90.035208 - pdf
6. J. S. Teguh, T. C. Sum and E. K. L. Yeow, "Effect of Charge Accumulation on the Stability of PEDOT: PSS During Device Operation", Chemical Physics Letters607 52-56 (2014) - pdf
7. A. Solanki, B. Wu, T. Salim, E. K. L. Yeow, Y. M. Lam and T. C. Sum*, "Performance Improvements in Polymer Nanofiber:Fullerene Solar Cells with External Electric Field Treatment", Journal of Physical Chemistry C118 11285-11291 (2014) - DOI:10.1021/jp5040097 - pdf
8. T. C. Sum* and N. Mathews*, "Advancements in Perovskite Solar Cells: Photophysics behind the Photovoltaics (Invited Review)", Energy and Environmental Science7 2518-2534 (2014) - DOI:10.1039/C4EE00673A - pdf
9. S. T. Ha, X. Liu, Q. Zhang, D. Giovanni, T. C. Sum, Q. Xiong, "Synthesis of Organic–Inorganic Lead Halide Perovskite Nanoplatelets: Towards High‐Performance Perovskite Solar Cells and Optoelectronic Devices", Advanced Optical Materials 2, 838 – 844 (2014) - pdf
10. S. K. Muduli, S. Wang, S. Chen, C. F. Ng, C. H. A. Huan, T. C. Sum, H. S. Soo, "Mesoporous cerium oxide nanospheres for the visible-light driven photocatalytic degradation of dyes", Beilstein Journal of Nanotechnology 5 517–523 (2014) - pdf
11. D. Rajwar, X. Liu, Z. B. Lim, S. J. Cho, S. Chen, J. M. H. Thomas, A. Trewin, Y. M. Lam, T. C. Sum, A. C. Grimsdale, "Novel self-assembled 2D networks based on zinc metal ion co-ordination: synthesis and comparative study with 3D networks", RSC Advances 4 17680 - 17693 (2014) - pdf
12. M. Panahandeh-Fard, J. Yin, M. Kurniawan, Z. Wang, G. Leung, T. C. Sum and C. Soci*, "Ambipolar Charge Photogeneration and Transfer at GaAs/P3HT Heterointerfaces", Journal of Physical Chemistry Letters, 5 1144 - 1150 (2014) - pdf
13. G. C. Xing, N. Mathews*, S. S. Lim, N. Yantara, X. Liu, D. Sabba, M. Graetzel, S. Mhaisalkar and T. C. Sum*, "Low-temperature solution-processed wavelength-tunable perovskites for lasing", Nature Materials,13 476 - 480 (2014) - DOI:10.1038/nmat3911 - pdf - highlighted in Nature Materials News and Views (22 Apr 2014) by F. Laquai, "Materials for Lasers: All-round Perovskites", Nature Materials13 429 - 430 (2014)
14. J. I. Wong, N. Mishra, G. Xing, M. Li, S. Chakrabortty, T. C. Sum, Y. Shi, Y. Chan, H. Y. Yang, "Dual Wavelength Electroluminescence from CdSe/CdS Tetrapods", ACS Nano 8 2873-2879 (2014) - pdf
15. J. Zhao, J. I. Wong, J. Gao, G. Li, G. Xing, H. Zhang, T. C. Sum, H. Y. Yang, Y. Zhao, S. L. A. Kjelleberg, W. Huang, S. C. J. Loo, Q. Zhang, "Larger π-extended anti-/syn-aroylenediimidazole polyaromatic compounds: synthesis, physical properties, self-assembly, and quasi-linear conjugation effect", RSC Advances 4 17822 - 17831 (2014) - DOI: 10.1039/C4RA01049C - pdf
16. W. Chen, Q. Zhang, T. Salim, S. A. Ekahana, X. Wan, T. C. Sum, Y. M. Lam, A. C. H. Huan, Y. Chen, Q. Zhang, "Synthesis and photovoltaic properties of novel C60 bisadducts based on benzo[2,1,3]-thiadiazole", Tetrahedron70 6217–6221 (2014) - DOI: 10.1016/j.tet.2014.01.026 - pdf
17. T. M. Koh, K. Fu, Y. Fang, S. Chen, T. C. Sum, N. Mathews, S. G. Mhaisalkar, P. B. Boix and T. Baikie, "Formamidinium-containing Metal-Halide - An Alternative Material for Near-IR Absorption Perovskite Solar Cells", Journal of Physical Chemistry C 118 16458–16462 (2014) - DOI: 10.1021/jp411112k - pdf
18. X. Zeng, K.F. Tai, T. Zhang, C.W.J. Ho, X. Chen, C. H. A. Huan, T. C. Sum, and L. H. Wong, "Cu₂ZnSn(S,Se)₄ kesterite solar cell with 5.1% efficiency using spray pyrolysis of aqueous precursor solution followed by selenization", Solar Energy Materials and Solar Cells124 55- 60 (2014) - pdf
19. S-W. Cao, X. Liu, Y-P Yuan, Z-Y. Zhang, Y-S Liao, J. Fang, S. C. J. Loo, T. C. Sum and C. Xue*, "Solar-to-fuels conversion over In₂0₃/g-C₃N₄ hybrid photocatalysts", Applied Catalysis B: Environmental, 147 940 - 946 (2014) - 10.1016/j.apcatb.2013.10.029 - pdf
20. J. Y. Lek, G. C. Xing, T. C. Sum* and Y. M. Lam*, "Electron Transport Limitation in P3HT:CdSe Nanorods Hybrid Solar Cells", ACS Applied Materials and Interfaces6 894-902 (2014) - DOI: 10.1021/am4041515 - pdf
21. G. Yu, X. Liu, G. C. Xing, S. Chen, C. F. Ng, X. Wu, E. K. L. Yeow, W. S. Lew and T. C. Sum*, "Spatially-Resolved Ultrafast Optical Spectroscopy of Polymer-Grafted Residues on CVD Graphene", Journal of Physical Chemistry C118 708 -713 (2014) - DOI: 10.1021/jp406675r -pdf
22. S. Sun, T. Salim, N. Mathews, M. Duchamp, C. Boothroyd, G. C. Xing, T. C. Sum and Y. M. Lam*, "The origin of high efficiency in low-temperature solution-processable bilayer organometal halide hybrid solar cells", Energy and Environmental Science7 339 - 407 (2014) - DOI: 10.1039/c3ee43161d - pdf
23. Y. Liu, K. T. E. Chua, T. C. Sum and C. K. Gan*, "First-principles study of the lattice dynamics of Sb₂S₃", Physical Chemistry Chemical Physics16 345 -350 (2014) - DOI: 10.1039/C3CP53879F - pdf

1. G. Wang, J. Geng, X. Zhang, G. Xing, T. C. Sum, Y.-H. Lai, B. Liu, "Pegylated Conjugated Oligomers for Targeted Two-Photon Flurescence Imaging of Cancer Cells", Journal of Molecular and Engineering Materials 1 1340011 (2013)
2. D. Wang, P. Kanhere, M. J. Li, Q. Tay, Y. Tang, Y. Huang, T. C. Sum*, N. Mathews, T. Sritharan, and C. Zhong*, "Improving Photocatalytic H₂ evolution of TiO₂ via formation of {001}-{010} Quasi-heterojunctions", Journal of Physical Chemistry C117 22894 - 22902 (2013) - DOI: 10.1021/jp407508n - pdf
3. J. Lu, K. Zhang, X. Liu, H. Zhang, T. C. Sum, A. H. C. Neto and K. P. Loh*, "Order-disorder Transition in a Two-Dimensional Boron-Carbon-Nitride Alloy", Nature Communications 4:2681 (DOI:10.1038/ncomms3681) (2013) - pdf
4. G. C. Xing, N. Mathews*, S. Sun, S. S. Lim, Y. M. Lam, M. Grätzel, S. Mhaisalkar and T. C. Sum*, "Long-Range Balanced Electron and Hole-Transport Lengths in Organic-Inorganic CH₃NH₃PbI₃", Science342 344 - 347 (2013) - (DOI: 10.1126/science.1243167) - Full Text - highlighted in Science Perspective (18 Oct 2013) by G. Hodes, "Perovskite-Based Solar Cells", Science 342 317-318 (2013) and in Nature Materials News and Views (21 Nov 2013) by M. A. Loi and J. C. Hummelen, "Hybrid Perovskite Solar Cells: Perovskites under the Sun", Nature Materials 12 1087 - 1089 (2013)
5. X. Liu, Q. Zhang, J. N. Yip, Q. Xiong* and T. C. Sum*, "Wavelength Tunable Single Nanowire Lasers Based on Surface Plasmon Polariton Enhanced Burstein-Moss Effect", NanoLetters,13 5336 - 5343 (2013) - (DOI: 10.1021/nl402836x) - pdf
6. S.-W. Cao, X. Liu, Y.-P. Yuan, Z.-Y. Zhang, J. Fung, J. Loo, J. Barber, T. C. Sum and C. Xue*, "Artificial Photosynthetic Hydrogen Evolution over g-C3N4 Nanosheets Coupled with Cobaloxime", Physical Chemistry Chemical Physics15 18363 - 18366 (2013) - (DOI: 10.1039/C3CP53350F) - pdf
7. Q. Tay, X. Liu, Y. Tang, Z. Jiang, T. C. Sum* and Z. Chen*, "Enhanced Photocatalytic Hydrogen Production with Synergistic Two-Phase Anatase/Brookite TiO2 Nanostructures", Journal of Physical Chemistry C 117 14973–14982 (2013) – (DOI: 10.1021/jp4040979) - pdf
8. B. Wu, X. Wu, C. Guan, K. F. Tai, E. K. L. Yeow, H. J. Fan, N. Mathews* and T. C. Sum*, "Uncovering Loss Mechanisms in Silver Nanoparticle-Blended Plasmonic Organic Solar Cells", Nature Communications 4:2004 (DOI: 10.1038/ncomms3004) (2013) - pdf
9. X. Liu, Q. Zhang, G. C. Xing, Q. Xiong and T. C. Sum*, "Size-Dependent Exciton Recombination Dynamics in Single CdS Nanowires Beyond the Quantum Confinement Regime", Journal of Physical Chemistry C 117, 10716 – 10722 (2013) – (DOI: 10.1021/jp312850w) - pdf
10. G. C. Xing, J. Luo, H. Li, B. Wu, X. Liu, C. H. A. Huan, H. J. Fan, and T. C. Sum*, "Ultrafast Exciton Dynamics and Two-Photon Pumped Lasing from ZnSe Nanowires", Advanced Optical Materials 1, 319 – 326 (2013) – Inside Front Cover - (DOI: 10.1002/adom.201200045) - pdf
11. Y. Tang, Z. Jiang, G. C. Xing, A. Li, P. D. Kanhere, Y. Zhang, T. C. Sum, S. Li, X. Chen, Z. Dong and Z. Chen*, "Efficient Ag@AgCl Cubic Cage Photocatalysts Profit from Ultrafast Plasmon-Induced Electron Transfer Process", Advanced Functional Materials 23, 2932 – 2940 (2013) – (DOI: 10.1002/adfm.201203379) – pdf
12. M. Liu, R. Chen, G. Adamo, K. F. MacDonald, E. J. Sie, T. C. Sum, N. I. Zheludev, H. Sun*, H. J. Fan*, "Tuning the influence of metal nanoparticles on ZnO photoluminescence by atomic-layer-deposited dielectric spacer", Nanophotonics 2, 153-160 (2013) – (DOI: 10.1515/nanoph-2012-0040) - pdf
13. Y. Zhang, Y. Tang, X. Liu, Z. Dong, H. H. Hng, Z. Chen, T. C. Sum* and X. Chen*, "Three-Dimensional CdS-Titanate Composite Nanomaterials for Enhanced Visible-Light-Driven Hydrogen Evolution", Small 9, 996 – 1002 (2013) – (DOI: 10.1002/smll.201202156) - pdf
14. L. T. Su, S. K. Karuturi, J. Luo, L. Liu, X. Liu, J. Guo, T. C. Sum, R. Deng, H. J. Fan, X. Liu*, A. I. Y. Tok*, "Photon Upconversion in Hetero-nanostructured Photoanodes for Enhanced Near-Infrared Light Harvesting", Advanced Materials 25, 1603 – 1607 (2013) – (DOI: 10.1002/adma.201204353) - pdf
15. M. J. Li, G. C. Xing, G. Z. Xing, B. Wu, T. Wu, X. H. Zhang and T. C. Sum*, "Origin of the Green Emission and the Charge Trapping Dynamics in ZnO Nanowires", Physical Review B 87, 115309 (2013) – (DOI: 10.1103/PhysRevB.87.115309) - pdf
16. X. Liu, Q. Zhang, Q. Xiong* and T. C. Sum*, "Tailoring the lasing modes in semiconductor nanowire cavities using intrinsic self-absorption", NanoLetters 13, 1080 – 1085 (2013) – (DOI: 10.1021/nl304362u) - pdf
17. J. S. Teguh, M. Kurniawan, X. Wu, T. C. Sum and E. K. L. Yeow*, "Other Origins for the Fluorescence Modulation of Single Dye Molecules in Open-circuit and Short-circuit Devices", Physical Chemistry Chemical Physics 15, 90 – 93 (2013) – (DOI: 10.1039/C2CP43284F) - pdf

1. Q. Zhang, X. Liu, M. I. B. Utama, J. Zhang, M. de la Mata, J. Arbiol, Y. Lu , T. C. Sum* and Q. Xiong*, "Highly Enhanced Exciton Recombination Rate by Strong Electron–Phonon Coupling in Single ZnTe Nanobelt", NanoLetters 12, 6420 - 6427 (2012) – (DOI: 10.1021/nl3037867) - pdf
2. G. C. Xing, Y. Liao, X. Wu, S. Chakrabortty, X. Liu, E. K. L. Yeow, Y. Chan* and T. C. Sum*, "Ultralow Threshold Two-Photon Pumped Amplified Spontaneous Emission and Lasing from Seeded CdSe/CdS Nanorod Heterostructures", ACSNano, 6, 10835 – 10844 (2012) – (DOI: 10.1021/nn304200a) - pdf
3. B. Wu, X. Liu, T. Z. Oo, G. C. Xing, N. Mathews and T. C. Sum*, "Resonant Aluminum Nanodisk Array for Enhanced Tunable Broadband Light Trapping in Ultra-thin Bulk Heterojunction Organic Photovoltaic Devices", Plasmonics 7, 677 – 684 (2012) – (DOI: 10.1007/s11468-012-9358-0) - pdf
4. M. Kurniawan, T. Salim, K. F. Tai, S. Sun, E. J. Sie, X. Wu, E. K. L. Yeow, C. H. A. Huan, Y. M. Lam and T. C. Sum*, "Carrier Dynamics in Polymer-Nanofiber:Fullerene Solar Cells", Journal of Physical Chemistry C 116, 18015 – 18022 (2012) – (DOI: 10.1021/jp302968e) - pdf
5. M. J. Li, B. Wu, S. A. Ekahana, M. I. B. Utama, G. C. Xing, Q. Xiong, T. C. Sum* and X. H. Zhang*, "Size and Surface Effects on Transient Photoconductivity in CdS Nanobelts probed by Time-Resolved Terahertz Spectroscopy", Applied Physics Letters 101, 091104 (2012) – (DOI: 10.1063/1.4748300) - pdf
6. J. Pan, Md. I. B. Utama, Q. Zhang, X. Liu, B. Peng, L. M. Wong, T. C. Sum, S. Wang, Q. Xiong, Composition-Tunable Vertically Aligned CdSxSe1-x Nanowire Arrays via van der Waals Epitaxy: Investigation of Optical Properties and Photocatalytic Behavior", Advanced Materials 24, 4151 – 4156 (2012) – (DOI: 10.1002/adma.201104996) - pdf
7. B. Wu, T. Z. Oo, X. Li, X. Liu, X. Wu, E. K. L. Yeow, H. Fan, N. Mathews and T. C. Sum*, "Efficiency Enhancement in Bulk-Heterojunction Solar Cells Integrated with Large Area Ag Nano-Triangle Arrays", Journal of Physical Chemistry C 116, 14820 – 14825 (2012) – (DOI: 10.1021/jp303672f) - pdf
8. B. Peng, Q. Zhang, X. Liu, Y. Ji, H. V. Demir, C. H. A. Huan, T. C. Sum and Q. Xiong, "Flurophore-Doped Core-Multishell Spherical Plasmonic Nanocavities: Resonant Energy Transfer toward a Loss Compensation", ACSNano 6, 6250 – 6259 (2012) – (DOI: 10.1021/nn301716q) - pdf
9. Y. Liao, G. C. Xing, N. Mishra, T. C. Sum, Y. Chan, "Low Threshold, Amplified Spontaneous Emission from Core-Seeded Semiconductor Nanotetrapods Incorporated into a Sol–Gel Matrix", Advanced Materials 24, OP159 – OP164 (2012) – (DOI: 10.1002/adma.201200121) - pdf
10. T. Z. Oo, N. Mathews, G. C. Xing, B. Wu, B. Xing, L. H. Wong, T. C. Sum and S. G. Mhaisalkar, "Ultrafine Au Networks as Plasmonic Antennae in Organic Photovoltaics", Journal of Physical Chemistry C 116, 6453 – 6458 (2012) – (DOI: 10.1021/jp2099637) - pdf
11. J. Gao, X. Liu, Y. Liu, L. Yu, Y. Feng, H. Chen, Y. Li, G. Rakesh, C. H. A. Huan, T. C. Sum, Y. Zhao and Q. Zhang, "Experimental and Theoretical Studies on Pyrene-grafted polyoxometalate hybrid", Dalton Transactions, 41, 12185 – 12191 (2012) – (DOI: 10.1039/C2DT31474F) - pdf
12. X. Wu, G. C. Xing, S. L. J. Tan, R. D. Webster, T. C. Sum and E. K. L. Yeow, "Hole transfer dynamics from dye molecules to p-type NiO nanoparticles: effects of processing conditions", Physical Chemistry Chemical Physics, 14, 9511 – 9519 (2012) – (DOI: 10.1039/C2CP40926G) - pdf
13. M. J. Li, G. C. Xing, L. F. N. Ah Qune, G. Z. Xing, T. Wu, C. H. A. Huan, X. H. Zhang* and T. C. Sum*, "Tailoring the Charge Carrier Dynamics in ZnO Nanowires: the role of surface hole/electron traps", Physical Chemistry Chemical Physics, 14, 3075 – 3082 (2012) – (DOI: 10.1039/C2CP23425D) - pdf

1. X. C. Dong, G. C. Xing, M. B. Chan-Park, W. H. Shi, N. Xiao, J. Wang, Q. Y. Yan, T. C. Sum, W. Huang and P. Chen, "The formation of a carbon nanotube-graphene oxide core-shell structure and its possible applications", Carbon, 49, 5071-5078 (2011) – (DOI: 10.1016/j.carbon.2011.07.025) - pdf
2. S. Chakrabortty, G. C. Xing, Y. Xu, S. W. Ngiam, N. Mishra, T. C. Sum and Y. Chan, "Engineering Fluorescence in Au-Tipped, CdSe-Seeded CdS Nanoheterostructures", Small, 7 2847–2852 (2011) – (DOI: 10.1002/smll.201100976) - pdf
3. G. C. Xing, S. Chakrabortty, S. W. Ngiam, Y. Chan and T. C. Sum*, "Three-photon absorption in Seeded CdSe/CdS Nanorod Heterostructures", Journal of Physical Chemistry C, 115, 17711-17716 (2011) – (DOI: 10.1021/jp205238q) - pdf
4. L. T. Su, J. Ye, S. K. Karuturi, L. J. Liu, Y. Zhao, J. Guo, L. F. N. A. Qune, T. C. Sum and A. I. Y. Tok, "High index, reactive facet-controlled synthesis of one-dimensional single crystalline rare earth hydroxide nanobelts", CrystEngComm, 13, 5367 – 5373 (2011) – (DOI: 10.1039/C1CE05357D) - pdf
5. X. Xu, Y. Zhao, E. J. Sie, Y. Lu, B. Liu, S. A. Ekahana, X. Ju, Q. Jiang, J. Wang, H. D. Sun, T. C. Sum*, C. H. A. Huan, Y. P. Feng, and Q. Xiong*, "Dynamics of Bound Exciton Complexes in CdS Nanobelts", ACS Nano, 5, 3660 (2011) – (DOI: 10.1021/nn2008832) - pdf
6. G. Z. Xing, G. C. Xing, M. J. Li, E. J. Sie, D. D. Wang, A. Sulistio, Q. L. Ye, C. H. A. Huan, T. Wu and T. C. Sum*, "Charge Transfer Dynamics in Cu-doped ZnO nanowires", Applied Physics Letters 98 (2011) - (See also Virtual Journal of Nanoscale Science & Technology, 23, No. 11 (2011)) – (DOI: 10.1063/1.3558912) - pdf
7. J. Q. Chen, X. Wang, Y. H. Lu, A. R. Barman, G. J. You, G. C. Xing, T. C. Sum, S. Dhar, Y. P. Feng, Ariando Q. H. Xu, T. Venkatesan, "Defect dynamics and spectral observation of twinning in single crystalline LaAlO3 under subbandgap excitation", Applied Physics Letters, 98, 041904 (2011) – (DOI: 10.1063/1.3543840) - pdf

1. B. Liu, C. W. Cheng, R. Chen, S.A Ekahana, W. F. Yang, S. J. Wang, T. C. Sum, Z. X. Shen, H. J. Fan & H. D. Sun, "Surface plasmon induced exciton redistribution in ZnCdO/ZnO coaxial multiquantum-well nanowires", Applied Physics Letters, 97, 081107 (2010) - pdf
2. G. C. Xing, S. Chakrabortty, K. L. Chou, N. Mishra, C. H. A. Huan, Y. Chan and T. C. Sum*, "Enhanced Tunability of the Multi-photon Absorption Cross-Section in Seeded CdSe/CdS Nanorod Heterostructures", Applied Physics Letters 97 061112 (2010) - (See also Virtual Journal of Nanoscale Science & Technology, 22, No. 9 (2010)) - (DOI: 10.1063/1.3479048) - pdf
3. X. D. Lim, H. R. Xu, Y. H. N. Chew, Y. H. Phua, E. J. Sie, T. C. Sum, G. H. Chia, W. S. Chin and C. H. Sow, "Nanoparticle fractionation using an aligned carbon nanotube array", Nanotechnology, 21, 295702 (2010) - pdf
4. T. Z. Oo, N. Mathews, T. L. Tam, G. C. Xing, T. C. Sum, A. Sellinger, L. H. Wong & S. G. Mhaisalkar, "Investigation of photophysical, morphological and photovoltaic behavior of poly(p-phenylene vinylene) based polymer/oligomer blends", Thin Solid Films, 518, 5292-5299 (2010) - pdf
5. G. Z. Xing, X. S. Fang, Z. Zhang, D. D. Wang, X. Huang, J. Guo, L. Liao, Z. Zheng, H. R. Xu, T. Yu, Z. X. Shen, C. H. A. Huan, T. C. Sum, H. Zhang & T. Wu, "Ultrathin single-crystal ZnO nanobelts: Ag-catalyzed growth and field emission property", Nanotechnology, 21, 255701 (2010) - pdf
6. G. Z. Xing, D. D. Wang, J. B. Yi, L. L. Yang, M. Gao, M. He, J. H. Yang, J. Ding, T. C. Sum and T. Wu, "Correlated d0 ferromagnetism and photoluminescence in undoped ZnO nanowires", Applied Physics Letters, 96, 112511 (2010) - pdf
7. C. W. Cheng, B. Liu, E. J. Sie, W. W. Zhou, J. X. Zhang, H. Gong, C. H. A. Huan, T. C. Sum*, H. D. Sun, & H. J. Fan*, "ZnCdO/ZnO Coaxial Multiple Quantum Well Nanowire Heterostructures and Optical Properties", Journal of Physical Chemistry C, 114 3863 (2010) – (DOI: 10.1021/jp911310r) - pdf
8. G. C. Xing, H. C Guo, X. H. Zhang, T. C. Sum* & C. H. A. Huan, "The Physics of ultrafast saturable absorption in graphene", Optics Express 18 4564 (2010) - An OSA Spotlight on Optics article - (DOI: 10.1364/OE.18.004564) - pdf
9. C. W. Cheng, E. J. Sie, B. Liu, C. H. A. Huan, T. C. Sum, H. D. Sun,and H. J. Fan, "Surface plasmon enhanced band edge luminescence of ZnO nanorods by capping Au nanoparticles", Applied Physics Letters 96 071107 (2010) - pdf

1. T. L. Li, W. L. Li, B. Chu, Z. S. Su, Y. R. Chen, L. L. Han, D. Y. Zhang, X. Li, F. X. Zang, T. C. Sum and A. C. H. Huan, "Enhanced electroluminescence and reduced efficiency roll-off in electrophosphorescent devices using a very high electron mobility material as emitter host and electron transporter", Journal of Physics D: Applied Physics 42 065103 (2009) - pdf
2. K. W. Liu, Y. D. Tang, C. X. Cong, T. C. Sum, C. H. A. Huan, Z. X. Shen, L. Wang, F. Y. Jiang, X. W. Sun, H. D. Sun, "Giant enhancement of top emission from ZnO thin film by nanopatterned Pt", Applied Physics Letters 94 151102 (2009) - pdf
3. G. Z. Xing, J. B. Yi, D. D. Wang, L. Liao, T. Yu, Z. X. Shen, C. H. A. Huan, T. C. Sum, J. Ding, and T. Wu, Strong correlation between ferromagnetism and oxygen deficiency in Cr-doped In2O3 nanostructures, Physical Review B, 79, 1 (2009) - pdf
4. F. X. Zang, T. C. Sum*, Furong Zhu, Z. R. Hong, X. Y. Sun, W. L. Li and C. H. A. Huan, "Modulated Infrared Electroluminescence from Organic Light-emitting Diodes", Journal of Lightwave Technology 27 1522 (2009) - (DOI: 10.1109/jlt.2009.2013872) - pdf

1. G. Z. Xing, J. B. Yi, J. G. Tao, L. M. Wong, Z. Zhang, G. P. Li, S. J. Wang, J. Ding, T. C. Sum, A. C. H. Huan and T. Wu "Comparative Study of Structural Inhomogeneity Enhanced Room-Temperature Ferromagnetism in Cu-Doped ZnO Nanowires", Advanced Materials, 20, 3521 – 3527 (2008) - pdf
2. S. L. Huang, L. X. Guan, J. B. Yi, B. C. Zhao, Y. Wu, Z. C. Fan, T. C. Sum, J. Ding, L. Wang, "Magnetic and electric transport properties of Nd0.75Sr1.25Co1-xMnxO4", Journal of Applied Physics 104 123904 (2008) - pdf
3. F. X. Zang, T. C. Sum*, A. C. H. Huan, T. L. Li, W. L. Li and F. R. Zhu, "Reduced Efficiency Roll-off in Phosphorescent Organic Light Emitting Diodes at Ultra-high Current Densities by Suppression of Triplet-Polaron Quenching", Applied Physics Letters, 93 (2), 23309 (2008) - pdf
4. Z. Zhang, J. B. Yi, J. Ding, L. M. Wong, H. L. Seng, S. J. Wang, J. G. Tao, G. P. Li, G. Z. Xing, T. C. Sum, A. C. H. Huan and T. Wu, "Cu-doped ZnO Nanoneedles and Nanonails: Morphological evolution and physical properties", The Journal of Physical Chemistry C, 112 (26), 9579 - 9585 (2008) – (DOI: 10.1021/jp710837h) - pdf

Micro-optics and Applications of Nuclear Micro-beams and Proton Beam Writing

1. T. C. Sum*, A. A. Bettiol, Catalin Florea and F. Watt, "Proton Beam Writing of Poly-methylmethacrylate Buried Channel Waveguides", Journal of Lightwave Technology, 24 (10), 3803 – 3809 (2006)
2. A. A. Bettiol, S. Venugopal Rao, T. C. Sum, J. A. van Kan and F. Watt, "Fabrication of Optical Waveguides using Proton Beam Writing", Journal of Crystal Growth, 288, 209 – 212 (2006)
3. T. C. Sum*, A. A. Bettiol, J. A. van Kan, S. Venugopal Rao, F. Watt, K. Liu and E. Y. B. Pun, "Direct imaging of the end-of-range and surface profiles of proton-beam written erbium-doped waveguide amplifiers by atomic force microscopy", Journal of Applied Physics, 98, 033533 - 033537 (2005)
4. T. C. Sum*, A. A. Bettiol, K. Liu, M. Q. Ren, E. Y. B. Pun, S. Venugopal Rao, J. A. van Kan and F. Watt, "Proton Beam Writing of Erbium Doped Waveguide Amplifiers"; Nuclear Instruments and Methods in Physics Research B, 231, 394 – 399 (2005)
5. A.A. Bettiol, T. C. Sum, F.C. Cheong, C.H. Sow, S. Venugopal Rao, J.A. van Kan, E.J. Teo, K. Ansari, F. Watt, "A Progress Review of Proton Beam Writing Applications in Microphotonics"; Nuclear Instruments and Methods in Physics Research B, 231, 364 – 371 (2005)
6. Jeroen A. Van Kan, Andrew A. Bettiol, Kambiz Ansari, Ee Jin Teo, Tze Chien Sum, Frank Watt, "Proton Beam Writing: A Progress Review", International Journal of Nanotechnology, 1, No. 4, 464 - 479 (2004)
7. T. C. Sum*, A. A. Bettiol, H. L. Seng, J. A. van Kan and F. Watt, "Direct Measurement of Proton-Beam-Written Polymer Optical Waveguide Sidewall Morphology using an Atomic Force Microscope"; Applied Physics Letters, 85, No. 8, 1398 – 1400 (2004). (See also Virtual Journal of Nanoscale Science and Technology, 10, No. 9 (2004))
8. K. Liu, E. Y. B. Pun, T. C. Sum, A. A. Bettiol, J. A. van Kan and F. Watt, "Erbium doped Waveguide Amplifiers Fabricated Using Focused Proton Beam Direct-writing", Applied Physics Letters, 84, No. 5, 684 – 686 (2004) – This work was also highlighted in Laser Focus World Newsbreaks Vol. 40, Issue 3, "Proton beam writes erbium-doped waveguide amplifiers"
9. T. C. Sum*, A. A. Bettiol, J. A. van Kan, F. Watt, E. Y. B. Pun and K. K. Tung; "Proton Beam Writing of Low-loss Polymer Optical Waveguides"; Applied Physics Letters, 83, No. 9, 1707 – 1709 (2003)
10. T. C. Sum*, A. A. Bettiol, H. L. Seng, I. Rajta, J. A. van Kan and F. Watt; "Proton Beam Writing of Passive Waveguides in PMMA"; Nuclear Instruments and Methods in Physics Research B, 210, 266 – 271 (2003)
11. A. A. Bettiol, T. C. Sum, J.A. van Kan and F. Watt; "Fabrication of Micro-Optical Components in Polymer using Proton Beam Micromachining and Modification"; Nuclear Instruments and Methods in Physics Research B, 210, 250 – 255 (2003)
12. H. L. Seng, T. Osipowicz, T. C. Sum, E. S. Tok, M. B. H. Breese, J. Zhang and F. Watt; "High Resolution Channeling Contrast Microscopy of Compositionally-Graded Si1-xGex Layers"; Nuclear Instruments and Methods in Physics Research B, 210, 483 – 488 (2003)
13. H. L. Seng, T. Osipowicz, T. C. Sum, E. S. Tok, G. Breton, N. J. Woods, and J. Zhang; "Probing the SiGe Virtual Substrate By High-Resolution Channeling Contrast Microscopy"; Applied Physics Letters, 80, 2940 – 2942 (2002)
14. H. L. Seng, T. Osipowicz, D. Mangelinck, P. S. Lee, T. C. Sum and F. Watt; "Micro-RBS Study of Nickel Silicide Formation"; Nuclear Instruments and Methods in Physics Research B, 181, 399 – 403 (2001)
15. J. A. Van Kan, A. A. Bettiol, B. S. Wee, T. C. Sum, T. Osipowicz and F. Watt; Proton Beam Micromachining: A New Tool for Precision 3D Microstructures; Sensors & Actuators A, 92, 370 – 374 (2001)
16. A. A. Bettiol, J. A. Van Kan, T. C. Sum, T. Osipowicz and F. Watt; A LabviewTM Based Scanning and Control System for Proton Beam Micromachining; Nuclear Instruments and Methods in Physics Research B, 181, 49 – 53 (2001)
17. T. Osipowicz, J. A. Van Kan, T. C. Sum, J. L. Sanchez, F. Watt; The Use of Microbeams for the Production of Microcomponents; Nuclear Instruments and Methods in Physics Research B, 161 – 163, 83 – 89 (2000)
18. J. A. Van Kan, T. C. Sum, T. Osipowicz and F. Watt; Sub 100 nm Proton Beam Micromachining: Theoretical Calculations on Resolution Limits; Nuclear Instruments and Methods in Physics Research B, 161 – 163, 366 – 370 (2000)

1. T. C. Sum, G. C. Xing, C. H. A. Huan, H. C. Guo & X. H. Zhang, "Probing Ultrafast Carrier-Carrier Scattering Dynamics in Epitaxial Graphene", 2010 Conference on Lasers and Electro-optics (CLEO) and Quantum Electronics & Laser Science Conference (QELS), San Jose, CA, 2010
2. G. Z. Xing, J. B. Yi, D. D. Wang, L. Liao, T. Yu, Z. X. Shen, C. H. A. Huan, T. C. Sum, J. Ding & T. Wu, "Bound Magnetic Polarons Induced Ferromagnetism in Transition-Metal-Doped Oxide Nanostructures", in 3rd IEEE International Nanoelectronics Conference, PKI Chu, Editors, INEC: 2010 3RD INTERNATIONAL NANOELECTRONICS CONFERENCE, VOLS 1 AND 2: 1120-1121, Hong Kong, PRC, 2010
3. T. C. Sum*, A. A. Bettiol, S. Venugopal Rao, J. A. van Kan, A. Ramam and F. Watt, Proton Beam Writing of Passive Polymer Optical Waveguides, in Micomachining Technology for Micro-optics and Nano-optics II, Eric G. Johonson and Gregory P. Nordin, Editors, Proceedings of SPIE 5347, pages 160 - 169 (Paper presented in an Oral Presentation at Photonics West 2004, San Jose, California, USA).
4. A. A. Bettiol, K. Ansari, T. C. Sum, J. A. van Kan and F. Watt, Fabrication of Micro-optical Components in Polymer using Proton Beam Writing, in Micromachining Technology for Microoptics and Nanooptics II, Eric G. Johnson and Gregory P. Nordin, Editors, Proceedings of SPIE 5347, pages 255 - 263.
5. K. Liu, E. Y. B. Pun, T. C. Sum, A. A. Bettiol, J. A. van Kan and F. Watt, "Erbium doped waveguide amplifier fabricated using focused proton beam irradiation", Proceedings of the 16th Annual Meeting IEEE Lasers and Eletro-Optics Society (LEOS 2003), Vol.1, 132 – 133, Tucson, AZ, USA, 2003.
6. K. Liu, E. Y. B. Pun, T. C. Sum, A. A. Bettiol, J. A. van Kan and F. Watt, "Waveguide amplifiers in Er3+-Yb3+ co-doped phosphate glasses written with focused proton beam", Proceedings of the 4th IEEE Hong Kong AP/MTT and LEOS Postgraduate Conference, 81 – 84, Oct.18, 2003.