Wallace C.H. Choy

PhD, Electronic Engineering, National Ion Beam (Implantation) Center, University of Surrey, UK. 1999

M Phil, Electronic Engineering, the University of Hong Kong. 1996

B Sc, Applied Physics, Hong Kong Baptist University  1994

The University of Hong Kong, Department of Electrical and Electronic Engineering. 2003- now

Res. Ass. Prof./ Ass. Prof./ Asso. Prof. (2003-07, 2008-11, 2011-16), Professor (2016-now)

Fujitsu Compound Semiconductor, Inc, San Jose, CA, USA. 2001-2002

Optoelectronic Module Design Engineer III (senior)

National Research Council of Canada, Ontario, Canada. 1999-2001

Postdoctoral fellow (1999-2001)

Short-term/Visit Appointment (Visiting Scientist)

Prof. Richard Friend, Cavendish Lab, University of Cambridge, Cambridge, UK. (2 months)   Jul-Aug 2013

Prof. Junji Kido, The Research Center for Organic Electronics, Yamagata University, Yonezawa-shi, Yamagata, Japan. Jul-Aug 2012

Prof. Karl Leo, Institut fur Angewandte Photophysik (IAPP), Technische Universitat Dresden, Dresden, Germany. Jun-Aug 2010

Prof. Yang Yang, Department of Material Science & Engineering, UCLA, Los Angeles, CA, USA. Jun-Aug 2009 & Jul-Aug 2011

Prof. George Malliaras, Department of Material Science & Engineering, Cornell University, Ithaca, NY, USA; Jun-Aug & Dec 2008

Research Interest: the design, physics, and mechanism of organic/inorganic optoelectronic devices; plasmonic nanostructures, nanoscale structures, and the hybrid systems with organic/inorganic materials; the multi-physical (optical, electrical, and thermal) properties and applications of the hybrid systems.

[1] X. He, F.Qi, X. Zou, Y. Li, H. Liu, X. Lu, K.S. Wong*, A.K.-Y. Jen*, W.C.H. Choy*, "Selenium substitution for dielectric constant improvement and hole-transfer acceleration in non-fullerene organic solar cells", Nature Comm., 15, 2103, 2024.

[2] J.J. Kim, K. Shuji, J. Zheng, X. He, A. Sajjad, H. Zhang, H. Su*, W.C.H. Choy*, "Tri-system integration in metal-oxide nanocomposites via in-situ solution-processed method for ultrathin flexible transparent electrodes", Nature Comm. 15, 2070, 2024.

[3] Z.W. Gao, Y. Wang*, X. Chen, Z. Jiang, M. Qin, W. Ning, B. Hu, X. Lu, W.J. Yin, D. Yang, B. Xu*, W.C.H. Choy*, "Reconstructing Subsurface Lattice for Stable Perovskite Photovoltaics", Joule 8, 1, 2024.

[4] J. Zheng, X.He, Y. Zhang, B.Lyu, J.Kim, S.Li, X. Lu, H. Su*, W.C.H. Choy*, "A Bottom-up Understanding of the Ligand-dominated Formation of Metallic Nanoparticle Electrodes with High Broadband Reflectance for Enabling Fully Solution-processed Large-area Organic Solar Cells", Energy & Environ. Sci., DOI:10.1039/D3EE00697B, 2023.

[5] H. Li, H. Lin, D. Ouyang, C.Yao, C.Li, J.Sun, Y. Song, Y. Wang, Y. Yan, Y. Wang*, Q. Dong*, W.C.H. Choy*, "Efficient and Stable Red Perovskite Light Emitting Diodes with Operational Stability > 300 h", Adv. Mater., 2008820, 2021.

[6] Y. Wang, G. Chen, D. Ouyang, X. He, C. Li, R. Ma, W.J. Yin*, W.C.H. Choy*, "High Phase Stability in CsPbI3 Enabled by Pb-I Octahedra Anchor High Phase Stability CsPbI3 for Efficient Inorganic Perovskite Photovoltaics ", Adv. Mater. 32, 2000186, 2020.

[7] H. Zhang, X.Ren, X.Chen, J.Mao, J.Cheng, Y. Zhao, Y. Liu, J. Milic, W.J. Yin, M. Grätzel, W.C.H. Choy*, "Improving the stability and performance of perovskite solar cells via off-the-shelf post-device ligand treatment", Energy & Environ. Sci., 11, 2253, 2018.

[8] H. Zhang, J.Cheng, D. Li, F.Lin, J.Mao, C.Liang, A.K.-Y. Jen, M. Grätzel, W.C.H. Choy*, "Toward All Room-Temperature, Solution-Processed, High-Performance Planar Perovskite Solar Cells: A New Scheme of Pyridine-Promoted Perovskite Formation", Adv. Mater., 29, 1604695, 2017. (citation: 200; IF=29.4)

[9] F. Jiang, W.C.H. Choy*, X. Li, D. Zhang, J. Cheng, "Post-Treatment-Free Solution Processed Non-Stoichiometric NiOx Nanoparticles for Efficient Hole Transport Layers of Organic Optoelectronic Devices", Adv. Mater., 27, 2930, 2015.  

[10] X.H. Li, W.C.H. Choy*, F.X. Xie, W.E.I. Sha, B. Ding, X. Guo, Y. Li, J. Hou*, J. You, Y. Yang, "Dual Plasmonic Nanostructures for High Performance Inverted Organic Solar Cells", Adv. Mater., 24, 3046, 2012.

Full publication list link:

https://www.eee.hku.hk/~chchoy-group/publications.html

- Elected Fellow of The Optical Society (OSA/ OPTICA), US  2017-present

- Top 1% of most-cited scientists in Thomson Reuter's Essential Science Indicators (ESI) 2014-2022

- Named as one of the "Highly Cited Researchers 2018" in the category of cross-fields by Clarivate Analytics according to Thomson Reuter's Essential Science Indicators (ESI) 2018

- Recognized as Prolific researcher on organic solar cells in the index (WFC in physical sciences) in Nature Index 2014 Hong Kong published by Nature. 2014

- Merit award for the GRF research project of “Exploring functionalities of plasmonic-electrical nanostructure incorporated metal oxides as buffer layers for enhancing the performances of organic photovoltaics”, the University of Hong Kong 2014

- Research Output Prize from the University of Hong Kong  2013

        To recognize the best research output in Faculty of Engineering in the year.

- Merit award for the GRF research project of “Effects of plasmonic nanostructures on the electrical properties of organic solar cells”, the University of Hong Kong 2013

- Merit award for the GRF research project of “Theoretical and experimental studies of the plasmonic resonance enhanced polymer thin-film solar cells”, the University of Hong Kong 2011

- Merit award for the GRF research project of “Enhanced light emission of multilayered fluorescence nanoparticles by the Purcell effect”, the University of Hong Kong 2009

- Merit award for the GRF research project of “Wavelength tunable organic light emitting diodes for high resolution color display applications”, the University of Hong Kong 2006

- Outstanding Achievement Award from National Research Council of Canada 2001

- Inventor and Innovator Award from National Research Council of Canada  2000