期刊
SMALL
卷 13, 期 42, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201701881
关键词
broadband; Cu3-xP; flexibility; graphene; photodetector
类别
资金
- National Natural Science Foundation of China [61604102, 51290273, 11404372, 91433107, 51601131]
- Youth 973 program [2015CB932700]
- National Key Research & Development Program [2016YFA0201902]
- ARC [DP140101501, CE170100039, FT150100450]
- China Postdoctoral Science Foundation [2014M550303, 2014M551654]
- Natural Science Foundation of Jiangsu Province [BK20130328, BK20150053]
- Natural Science Foundation of Hubei Province [2016CFB166]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Australian Research Council (ARC) Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET)
The integration of graphene with colloidal quantum dots (QDs) that have tunable light absorption affords new opportunities for optoelectronic applications as such a hybrid system solves the problem of both quantity and mobility of photocarriers. In this work, a hybrid system comprising of monolayer graphene and self-doped colloidal copper phosphide (Cu3-xP) QDs is developed for efficient broadband photodetection. Unlike conventional PbS QDs that are toxic, Cu3-xP QDs are environmental friendly and have plasmonic resonant absorption in near-infrared (NIR) wavelength. The half-covered graphene with Cu3-xP nanocrystals (NCs) behaves as a self-driven p-n junction and shows durable photoresponse in NIR range. A comparison experiment reveals that the surface ligand attached to Cu3-xP NCs plays a key role in determining the charge transfer efficiency from Cu3-xP to graphene. The most efficient three-terminal photodetectors based on graphene-Cu3-xP exhibit broadband photoresponse from 400 to 1550 nm with an ultrahigh responsivity (1.59 x 10(5) A W-1) and high photoconductive gain (6.66 x 10(5)) at visible wavelength (405 nm), and a good responsivity of 9.34 A W-1 at 1550 nm. The demonstration of flexible graphene-Cu3-xP photodetectors operated at NIR wavelengths may find potential applications in optical sensing, biological imaging, and wearable devices.
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