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Self-powered asymmetric metal–semiconductor–metal AlN deep ultraviolet detector

Tao Li, Wenqing Song, Lei Zhang, Jianchang Yan, Wenhui Zhu, and Liancheng Wang

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Abstract

Self-powered ultraviolet detectors may find application in aviation and military fields. Here we demonstrate a self-powered asymmetric metal–semiconductor–metal (MSM) deep ultraviolet (DUV) detector with an Ni/Al electrode contact to AlN, and a photoelectric response current increase from dark current (Id) 2.6 × 10−12 A to 1.0 × 10−10 A after UV illumination (Ip) at 0 V bias. To further improve device performance, trenches are etched in AlN, and the Ni/Al electrodes are deposited in trenches to form a three-dimensional MSM (3D-MSM) structure. The improved performance is attributed to the stronger electric field from the asymmetric electrode and a shorter carrier migration path from the 3D-MSM device configuration. Our work will promote the development and application of DUV self-powered devices.

© 2022 Optical Society of America

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Supplementary Material (1)

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