InGaAs/graphene infrared photodetectors with enhanced responsivity

doi:10.1088/2053-1591/ab4925

	InGaAs/graphene infrared photodetectors with enhanced responsivity
	Yang,Qi 1,2; Wu,Qiming 1,2; Luo,Wei 1; Yao,Wei 1; Yan,Shunya 1; Shen,Jun1,2
刊名	Materials Research Express
	2019-10-11
卷号	6 期号:11
关键词	graphene InGaAs infrared photodetectors responsivity
ISSN号	2053-1591
DOI	10.1088/2053-1591/ab4925
英文摘要	Abstract High responsivity is a vital aim of photodetectors research. Based on the photogating effect, ultra-high responsivity can be realized by combining the high mobility of graphene and strong light absorption of other materials. Due to long carrier lifetime and low mobility, quantum dots(QDs) are usually used to form hybrid photodetectors with graphene. However, hybrid photodetectors of graphene with materials possessing higher mobility are rarely studied at present. In this paper, the hybrid photodetector of graphene and InGaAs is studied. We fabricated and measured pure InGaAs photodetectors, hybrid photodetectors of the whole graphene on InGaAs surface and hybrid photodetectors of graphene nanoribbons(GNRs) on InGaAs surface. It is found that, compared to pure InGaAs photodetectors, the responsivity of the whole graphene on InGaAs surface devices increases by 14.7 times, which is 7.66 A W?1, and the response time is twice faster. We also found that the negative back voltage can increase the photocurrent by modulating the Fermi energy of graphene and barrier height of the hybrid photodetectors. The illuminated area effect on various devices area was discussed in this study. In terms of theoretical mechanization, as high mobility materials, both graphene and InGaAs could generate and transport carriers in this hybrid photodetector under optical illumination. The photoexcited holes in InGaAs enter graphene while the photoexcited electrons in graphene enter InGaAs due to the built-in field, which leads to a charge build-up on both sides of the junction and a strong photogating effect on the channel conductance. The results of this study are of novel significance for the development of infrared detectors based on graphene.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:2053-1591-6-11-AB4925
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/9630]
专题	中国科学院重庆绿色智能技术研究院
作者单位	1.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, People’s Republic of China 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
推荐引用方式 GB/T 7714	Yang,Qi,Wu,Qiming,Luo,Wei,et al. InGaAs/graphene infrared photodetectors with enhanced responsivity[J]. Materials Research Express,2019,6(11).
APA	Yang,Qi,Wu,Qiming,Luo,Wei,Yao,Wei,Yan,Shunya,&Shen,Jun.(2019).InGaAs/graphene infrared photodetectors with enhanced responsivity.Materials Research Express,6(11).
MLA	Yang,Qi,et al."InGaAs/graphene infrared photodetectors with enhanced responsivity".Materials Research Express 6.11(2019).