In summary, we demonstrated the fabrication of Gr/PdSe2/Ge heterojunctions by directly transferring 2D PdSe2 film onto a pre-patterned Ge wafer. Owing to the use of high-quality PdSe2 film fabricated by a simple selenization approach, enhanced light harvesting by the mixed- dimensional van der Waals heterojunction, and improved carrier collection efficiency with graphene transparent electrode, the as-fabricated heterojunction exhibited an excellent device
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Highly Polarization-Sensitive, Broadband, Self-Powered Photodetector Based on Graphene/PdSe₂/Germanium Heterojunction
Di Wu, Jiawen Guo, Juan Du, Congxin Xia, Longhui Zeng, Yongzhi Tian, Zhifeng Shi, Yongtao Tian, Xin Jian Li, Yuen Hong Tsang, Jiansheng Jie
Research context
Polarization-sensitive photodetection in a broad spectrum range is highly desired due to the great significance in military and civilian applications. Palladium diselenide (PdSe 2 ), a newly explored air-stable, group 10 two-dimensional (2D) noble metal dichalcogenide with a puckered pentagonal structure, holds promise for polarization-sensitive photodetection. Herein, we report a highly polarization-sensitive, broadband, self-powered photodetector based on graphene/PdSe 2 /germanium heterojunction. Owing to the enhanced light absorption of the mixed-dimensional van der Waals heterojunction and the effective carrier collection with graphene transparent electrode, the photodetector exhibits superior device performance in terms of a large photoresponsivity, a high specific detectivity, a fast response speed to follow nanosecond pulsed light signal, and a broadband photosensitivity ranging from deep ultraviolet (DUV) to mid-infrared (MIR). Significantly, highly polarization-sensitive broadband photodetection with an ultrahigh polarization sensitivity of 112.2 is achieved, which represents the best result for 2D layered material-based photodetectors. Further, we demonstrated the high-r
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Di Wu, Jiawen Guo, Juan Du, Congxin Xia, Longhui Zeng, Yongzhi Tian, Zhifeng Shi, Yongtao Tian, Xin Jian Li, Yuen Hong Tsang, Jiansheng Jie. Highly Polarization-Sensitive, Broadband, Self-Powered Photodetector Based on Graphene/PdSe₂/Germanium Heterojunction. ACS Nano (2019). https://doi.org/10.1021/acsnano.9b03994
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