期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 26, 页码 22419-22426出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05336
关键词
solar-blind ultraviolet; large-area detection; graphene/beta-Ga2O3 heterojunction; transparent conductive layer; hot carrier multiplication
资金
- National Natural Science Foundation [91333207, 61604178, U1505252, 61427901]
- Guangdong Natural Science Foundation [2014A030310014]
- Guangzhou Science and Technology Program [201607020036]
Solar-blind ultraviolet (SBUV) detection has important applications in wireless secure communication, early warning, and so forth. However, the desired key device for SBUV detection and high-sensitivity and low-noise sandwich photodetector with large detective area is difficult to be fabricated because it is usually hard for traditional wide band gap semiconductors to boast both high conductivity and high SBUV transparency. Here, we proposed to use graphene as the transparent conductive layer to form graphene/beta-Ga2O3 heterojunction. With the help of large-area graphene and hot carrier multiplication, a SBUV photodetector with large detective area, low dark current, and high sensitivity was successfully assembled. Its photoresponsivity is 1-3 orders of magnitude higher than that of the conventional SBUV photodetectors, and its response speed can rival the best device ever reported.
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