Configuration design of a 2D graphene/3D AlGaN van der Waals junction for high-sensitivity and self-powered ultraviolet detection and imaging

Author:

Yue Yuanyuan1,Chen Yang2ORCID,Jiang Jianhua1,Yao Lin1,Wang Haiyu3,Zhang Shanli2,Jia Yuping2,Jiang Ke2ORCID,Sun Xiaojuan2,Li Dabing2

Affiliation:

1. Jilin University of Finance and Economics

2. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

3. Jilin University

Abstract

Two-dimensional (2D) graphene has emerged as an excellent partner for solving the scarcity of ultraviolet photodetectors based on three-dimensional (3D) AlGaN, in which the design of a 2D graphene/3D AlGaN junction becomes crucial. This study investigates the response mechanisms of two distinct graphene/AlGaN (Gr-AlGaN) photodetectors in the lateral and vertical configurations. For the lateral Gr-AlGaN photodetector, photogenerated electrons drifting into p-type graphene channel induce negative photoconductivity and a persistent photoconductive effect, resulting in a high responsivity of 1.27×104  A/W and detectivity of 3.88×1012 Jones. Although the response capability of a vertical Gr-AlGaN device is inferior to the lateral one, it shows significantly reduced dark current and self-powered detection. The photogenerated electron-hole pair can be spontaneously separated by the junction electric field and generate a photocurrent at zero bias. Hence, the vertical Gr-AlGaN photodetector array is satisfied for passive driving imaging like deep space detection. Conversely, the exceptional response of the lateral Gr-AlGaN device emphasizes its prospects for steady object recognition with low-light emission. Moreover, the improved imaging sharpness with light illumination duration makes it suitable for biomimetic visual learning, which follows a recognition to memory process. This study elucidates an efficient approach for diverse photodetection applications through the configuration design of Gr-AlGaN junctions.

Funder

Natural Science Foundation of Jilin Province

Science and Technology Research Project of Education Department of Jilin Province

National Natural Science Foundation of China

Young Elite Scientists Sponsorship Program by CAST

General Project from Jilin University of Finance and Economics

Publisher

Optica Publishing Group

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