A self-powered sensitive ultraviolet photodetector based on epitaxial graphene on silicon carbide

doi:10.1088/1674-1056/25/6/067205

Abstract

A self-powered graphene-based photodetector with high performance is particularly useful for device miniaturization and to save energy. Here, we report a graphene/silicon carbide (SiC)-based self-powered ultraviolet photodetector that exhibits a current responsivity of 7.4 mA/W with a response frequency of over a megahertz under 325-nm laser irradiation. The built-in photovoltage of the photodetector is about four orders of magnitude higher than previously reported results for similar devices. These favorable properties are ascribed to the ingenious device design using the combined advantages of graphene and SiC, two terminal electrodes, and asymmetric light irradiation on one of the electrodes. Importantly, the photon energy is larger than the band gap of SiC. This self-powered photodetector is compatible with modern semiconductor technology and shows potential for applications in ultraviolet imaging and graphene-based integrated circuits.

Keywords: epitaxial graphene ultraviolet photodetector SiC self-powered

Received: 25 February 2016
Revised: 30 March 2016
Accepted manuscript online:

PACS:	72.80.Cw	(Elemental semiconductors)
	73.40.Kp	(III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)
	81.05.ue	(Graphene)
	85.60.Gz	(Photodetectors (including infrared and CCD detectors))

Fund:

Project supported by the National Key Basic Research Program of China (Grant Nos. 2011CB932700 and 2013CBA01603) and the National Natural Science Foundation of China (Grant Nos. 51472265 and 51272279).

Corresponding Authors: Li-Wei Guo, Xiao-Long Chen
E-mail: lwguo@iphy.ac.cn;xlchen@iphy.ac.cn

Cite this article:

Jiao Huang(黄郊), Li-Wei Guo(郭丽伟), Wei Lu(芦伟), Yong-Hui Zhang(张永晖), Zhe Shi(史哲), Yu-Ping Jia(贾玉萍), Zhi-Lin Li(李治林), Jun-Wei Yang(杨军伟), Hong-Xiang Chen(陈洪祥), Zeng-Xia Mei(梅增霞), Xiao-Long Chen(陈小龙) A self-powered sensitive ultraviolet photodetector based on epitaxial graphene on silicon carbide 2016 Chin. Phys. B 25 067205

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A self-powered sensitive ultraviolet photodetector based on epitaxial graphene on silicon carbide

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