Journal
ACS NANO
Volume 13, Issue 9, Pages 9907-9917Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b03994
Keywords
PdSe2; two-dimensional materials; heterojunction; polarization-sensitive photodetector; broadband photodetection
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Funding
- National Natural Science Foundation of China [51821002, 91833303, 61605174, 61774136, 11604302]
- Research Grants Council of Hong Kong, China [GRF 152093/18E PolyU B-Q65N]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC)
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Polarization-sensitive photodetection in a broad spectrum range is highly desired due to the great significance in military and civilian applications. Palladium diselenide (PdSe2), 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/PdSe2/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-resolution polarization imaging based on the heterojunction device. This work reveals the great potential of 2D PdSe2 for high-performance, air-stable, and polarization-sensitive broadband photodetectors.
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