| Monolayer graphene/germanium Schottky junction as high-performance self-driven infrared light photodetector |
Long-Hui Zeng, Ming-Zheng Wang, Han Hu, Biao Nie, Yong-Qiang Yu, Chun-Yan Wu, Li Wang, Ji-Gang Hu, Chao Xie, Feng-Xia Liang*, Lin-Bao Luo*
Abstract:We report on the simple fabrication of monolayer graphene (MLG)/germanium (Ge) heterojunction for infrared (IR) light sensing. It is found that the as-fabricated Schottky junction detector exhibits obvious photovoltaic characteristics, and is sensitive to IR light with high Ilight/Idark ratio of 2×104at zero bias voltage. The responsivity and detectivity are as high as 51.8 mAW-1 and 1.38×1010 cmHz1/2W-1,respectively. Further photoresponse study reveals that the photovoltaic IR detector displays excellent spectral selectivity with peak sensitivity at 1400 nm, and a fast light response speed of microsecond rise/fall time with good reproducibility and long term stability. The generality of the above results suggests that the present MLG/Ge IR photodetector would have great potential for future optoelectronic device applications..
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