Responsivity improvement of Ti–diamond–Ti structured UV photodetector through photocurrent gain | Zendy

Zhangcheng Liu | Zendy; Dan Zhao | Zendy; JinPing Ao | Zendy; Xiaohui Chang | Zendy; Yanfeng Wang | Zendy; Jiao Fu | Zendy; Minghui Zhang | Zendy; Hongxing Wang | Zendy

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Responsivity improvement of Ti–diamond–Ti structured UV photodetector through photocurrent gain

Author(s) -

Zhangcheng Liu,

Dan Zhao,

JinPing Ao,

Xiaohui Chang,

Yanfeng Wang,

Jiao Fu,

Minghui Zhang,

Hongxing Wang

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.017092

Subject(s) - responsivity , photocurrent , materials science , photodetector , optoelectronics , diamond , ultraviolet , optics , schottky barrier , photoconductivity , physics , diode , composite material

In this study, a Ti-diamond-Ti structured ultraviolet photodetector was fabricated on a homoepitaxial diamond layer with an oxygen-terminated surface. The properties of the Ti/diamond schottky contact were measured using X-ray photoelectron spectroscopy, and the barrier height was found to be 1.15 eV. At a bias of 3 V, the responsivity at 210 nm was only 4.29 mA/W, while at 12 V, the responsivity increased rapidly to 51 mA/W. The increase can be ascribed to the photocurrent gain. With the further increase in voltage, an avalanche effect was produced, and the responsivity could reach 1.18 A/W at 50 V. Moreover, the transient response behavior of the photodetector exhibited a good repeatability and response speed.

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