Views: 0 Author: Site Editor Publish Time: 2022-06-29 Origin: Site
9. UVPT based on AlGaN/GaN HEMT configuration
In August 2021, the University of Science and Technology of China (USTC) team demonstrated a UVPT based on an AlGaN/GaN HEMT configuration featuring a 10/10nm Ni/Au translucent gate.
It was found that a low dark current of 20 pA can be achieved when the device is biased in the off state. More importantly, the device can achieve excellent photodetection performance, characterized by peak R values of 3.6×107A/W under 265nm UV irradiation and 1.0×106A/W under 365nm UV irradiation. Further investigation of the VGS-dependent photoreaction of UVPT revealed that a more negative VGS would significantly reduce the rise/decay times detected at 265 nm due to the increased electric field in the absorptive AlGaN barrier.
This study provides a feasible device architecture for the photodetection behavior of AlGaN/GaN UVPTs, which will help the future development of high-performance UV PDs based on wide-bandgap semiconductors.
10. 10DUV LED high quality AIN film
10DUV LED High-Quality AlN Epitaxy In July 2021, researchers from Wuhan University fabricated high-quality AlN thin films on sapphire substrates with alternating V/III ratio superlattices.
The researchers demonstrated the feasibility of high-quality AlN epitaxy on sapphire at relatively low temperatures (1180 degrees Celsius) by introducing alternating V/III ratio AlN superlattice building blocks, also demonstrating alternating V/III The AlN superlattice plays a key role in strain relaxation and dislocation reduction by changing the dislocation tilting behavior. Oblique threading dislocations can also provide effective misfit dislocation segments to relax strain, thereby eliminating the risk of wafer cracking during AlN growth.
The breakthrough achieved by this research will bring important technical support for the performance improvement of AlGaN-based deep ultraviolet (DUV) LEDs in sterilization and disinfection.
In today's increasingly intelligent and intelligent lighting technology, the technical focus of national lighting people has long been not limited to "illumination", but more "invisible light" fields. The emergence of the new crown epidemic has accelerated the unremitting exploration of the field by the majority of scientific and technological workers. As an important part in the field of invisible light, ultraviolet light will bring more surprising industrial achievements to the public across the country and even the world under the "cutting rocks" of more cutting-edge scientific and technological achievements, and realize more epoch-making people's livelihood value.
