期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202102329
关键词
chemical doping; external quantum efficiency; graphene; open-circuit voltage; solar-blind ultraviolet
资金
- National Natural Science Foundation of China [91833301, 61427901]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2021B1515020105]
Chemical doping of the graphene hole transport layer has a significant impact on the open-circuit voltage (V-OC) of SBUV photovoltaic detectors, leading to an increase in external quantum efficiency (EQE). Modulating the Fermi level of graphene can effectively enhance V-OC and improve the photoelectric conversion efficiency of photovoltaic devices.
Improving the open-circuit voltage (V-OC) is a fundamental target for photovoltaic devices to obtain high photoelectric conversion efficiency (PCE). Here, it is reported that the chemical doping of graphene hole transport layer has a significant impact on the V-OC of solar-blind ultraviolet (SBUV) photovoltaic detectors. It has been demonstrated that the external quantum efficiency (EQE) of graphene/AlGaN/SiC heterojunction photovoltaic detectors increases from 21.6% to 38.1% when the Fermi level of graphene is precisely pulled down by a simple charge transfer process. Without sacrificing response speed, the approximate to 75% increase in EQE together with responsivity is the result of the enhancement of V-OC from 1.10 to 2.02 V. This work sheds light on the correlation between V-OC and graphene Fermi level in SBUV detectors, and provides effective avenues to modulate the PCE of photovoltaics.
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