Bolometric effect in a waveguide-integrated graphene photodetector

doi:10.1088/1674-1056/25/11/118103

Abstract

Graphene is an alternative material for photodetectors owing to its unique properties. These include its uniform absorption of light from ultraviolet to infrared and its ultrahigh mobility for both electrons and holes. Unfortunately, due to the low absorption of light, the photoresponsivity of graphene-based photodetectors is usually low, only a few milliamps per watt. In this letter, we fabricate a waveguide-integrated graphene photodetector. A photoresponsivity exceeding 0.11 A·W^-1 is obtained which enables most optoelectronic applications. The dominating mechanism of photoresponse is investigated and is attributed to the photo-induced bolometric effect. Theoretical calculation shows that the bolometric photoresponsivity is 4.6 A·W^-1. The absorption coefficient of the device is estimated to be 0.27 dB·μ^-1.

Keywords: graphene photodetector graphene bolometer bolometric effect waveguide integration

Received: 20 June 2016
Revised: 13 July 2016
Accepted manuscript online:

PACS:	81.05.ue	(Graphene)
	85.60.Dw	(Photodiodes; phototransistors; photoresistors)

Fund:

Project supported by the National Key Research and Development Program of China (Grant No. 2016YFB0402204), the High-Tech Research and Development Program of China (Grant Nos. 2013AA031401, 2015AA016902, and 2015AA016904), and the National Natural Science Foundation of China (Grant Nos. 61674136, 61176053, 61274069, and 61435002).

Corresponding Authors: Qin Han
E-mail: hanqin@semi.ac.cn

Cite this article:

Yubing Wang(王玉冰), Weihong Yin(尹伟红), Qin Han(韩勤), Xiaohong Yang(杨晓红), Han Ye(叶焓), Qianqian Lv(吕倩倩), Dongdong Yin(尹冬冬) Bolometric effect in a waveguide-integrated graphene photodetector 2016 Chin. Phys. B 25 118103

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[1]	Photoconductive multi-layer graphene photodetectors fabricated on etched silicon-on-insulator substrates Yu-Bing Wang(王玉冰), Wei-Hong Yin(尹伟红), Qin Han(韩勤), Xiao-Hong Yang(杨晓红), Han Ye(叶焓), Qian-Qian Lv(吕倩倩), Dong-Dong Yin(尹冬冬). Chin. Phys. B, 2017, 26(2): 028101.

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Bolometric effect in a waveguide-integrated graphene photodetector

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