Prof. Anthony H. W. Choi (蔡凱威), from Department of Electrical and Electronic Engineering at The University of Hong Kong, visited IAPME on 7-8 August, 2025. During his visit, he delivered an insightful presentation titled “Heterogeneous Integration of GaN optoelectronics with Si microelectronics” . The seminar was hosted by Prof. Handong Sun.
Prof. Choi is Full Professor and Associate Head of the Department of Electrical and Electronic Engineering at The University of Hong Kong. He received his PhD from the National University of Singapore under the supervision of Prof. Soo Jin Chua and completed his postdoctoral training in Professor Martin Dawson’s team at the University of Strathclyde, Glasgow, where he contributed to pioneering development work on III-Nitride emissive micro-light-emitting diode arrays, demonstrating applications in the areas of micro-displays and high-efficiency light sources. His current research interests include microdisk lasers, chipscale color micro-LED displays and GaN-Si heterogeneous integration.
In his talk, Prof. Choi first introduced the overview of GaN based photonic integration. To operate the GaN optoelectronic devices, systems involving devices also include Si microelectronics in the form of integrated circuits (IC), such as drivers, amplifiers and many other types of ICs. Conventionally, the GaN optoelectronic devices and Si microelectronics are individually packaged, which are then soldered onto printed circuit boards (PCB) to form functional circuits. Although commonly adopted, such types of integration tend to make the circuits and systems more bulky than is needed. Prof. Choi also presented the heterogeneous integration GaN optoelectronics devices (such as LEDs and photodiodes) with Si-based electronics at the chip-scale level. This includes the integration of GaN LEDs and LED arrays with CMOS driving circuit, and GaN photodetectors with CMOS transimpedance amplifiers.
During the visit of IAPME, Prof. Choi has exchanged ideas with members of Prof. Sun’s group.