Dual-wavelength ultraviolet photodetector based on vertical (Al,Ga)N nanowires and graphene

• 作者: Min Zhou Yukun Zhao Lifeng Bian Jianya Zhang Wenxian Yang Yuanyuan Wu Zhiwei Xing Min Jiang Shulong Lu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
• 页码范围: 732-737
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abff23

摘要

Due to the wide application of UV-A (320 nm-400 nm) and UV-C (200 nm-280 nm) photodetectors,dual-wavelength(UV-A/UV-C) photodetectors are promising for future markets.A dual-wavelength UV photodetector based on vertical(A1,Ga)N nanowires and graphene has been demonstrated successfully,in which graphene is used as a transparent electrode.Both UV-A and UV-C responses can be clearly detected by the device,and the rejection ratio (R254 nm/R450 nm) exceeds 35 times at an applied bias of-2 V.The short response time of the device is less than 20 ms.Furthermore,the underlying mechanism of double ultraviolet responses has also been analyzed systematically.The dual-wavelength detections could mainly result from the appropriate ratio of the thicknesses and the enough energy band difference of (A1,Ga)N and GaN sections.