The 29th International Conference on Amorphous and Nano-crystalline Semiconductors-Zhiyong Fan (Topic 9)

Zhiyong Fan

Flexible Thin Film Electronics

RM 2523, Academic Building, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR

Email: eezfan@ust.hk

Biography

Dr. Zhiyong Fan is a professor at the Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology. He is the founding Director of Center on Smart Sensors and Environmental Technologies, Associate Director of Materials Fabrication and Preparation Facility of HKUST. He is also a member of the State Key Laboratory of Advanced Display and Optoelectronics Technologies at HKUST, Fellow of the Royal Society of Chemistry, and Founding Member of the Young Academy of Sciences of Hong Kong. He is an Associate Editor of Journal of Semiconductors. He has won a number of awards, including HKUST SENG Young Investigator Award, Outstanding Research Award, HKUST President Award and Innovation Award, and the Shandong Natural Science Second Prize, 2020 Top 10 Research Progress on Semiconductors in China. His research interest is focused on novel nanomaterials for electronic, optoelectronic and sensing devices. Till date, he has published more than 210 peer reviewed papers with citations ~23,000, H index 80, and is a highly cited author of Clarivate Analytics. He also has ~30 Chinese and US patents.

Abstract for Presentation

Perovskite Nanowire Based Optoelectronic Devices on Flexible and Curved Substrates

Metal halide perovskite materials are regarded as highly promising materials for high performance optoelectronics due to excellent optical absorption, long carrier diffusion length, tunable composition, etc., thus have triggered broad attention for applications including solar cells, photodetectors and light-emitting diodes. Conventionally, solution processes have been utilized to fabricate perovskite materials. In our work, in order to achieve high material quality and device scalability, we have developed chemical vapor deposition process to grow ordered high density perovskite nanowire (NW) arrays in nanoengineering templates with materials including MAPbI3, MASnI3, CsPbI3 and FAPbI3, etc. The geometrical factors of NWs, namely, periodicity, diameter and length can be precisely nanoengineered. Intriguingly, we have discovered that the chemically and mechanically robust template can effectively protect perovskite NWs against water and oxygen invasion thus the material chemical stability and phase stability are significantly better than planar perovskite films. Furthermore, owing to the mechanical flexibility and the shape tunability of the templates, the three-dimensional NW arrays can be grown on flexible templates and also spherical/hemispherical templates which open vast opportunity for unique optoelectronic applications. As such, perovskite NW based flexible solar cells, photodetectors and light-emitting diodes (LEDs) were fabricated. Hemispherical bionic retina and spherical LEDs have also been successfully made. The results will be demonstrated in this presentation. And they demonstrate the attractive potential of perovskite NWs for novel and high performance optoelectronics.

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