期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 40, 页码 9912-9918出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03090
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资金
- National Key R&D Program of China [2017YFA0204600, 2018YFA0703700]
- National Natural Science Foundation of China [12061131009, 51872050]
- Science and Technology Commission of Shanghai Municipality [21520712600, 19520744300]
In this study, the dark current of a TiO2-based PD was effectively reduced by introducing 3 PC71BM, and the self-powered responsivity was increased to 33 mA/W through further optimization of interface layer and electrode material, achieving ultrafast rise/decay times.
TiO2-based photodetectors (PDs) have been hotspots in recent years for their excellent thermal stabilities and optoelectronic performance under ultraviolet (UV) light. However, the high dark current caused by defects in TiO2 films has limited the detectivity (D) magnitudes (from 0.1 mA to 20 nA) and D was increased to 1.2 x 10(14) Jones by introducing of these PDs. Here, the dark current of a TiO2-based PD was effectively reduced by 3 PC71BM. The TiO2/PC71BM heterojunction also made the PD self-powered, and by further introducing an interface layer of PEDOT:PSS and finely optimizing the electrode Ag nanowires (Ag NWs), the self-powered responsivity (R) was increased to 33 mA/W. Ultrafast rise/decay times (129 ns/l ms at -1 V and 0.06 s/<1 mu s at 0 V) were achieved. This work successfully applied an organic-inorganic heterojunction, an organic interface, and Ag NWs to suppress the dark current and enhance the self-powered photocurrent/R of inorganic PDs, providing a feasible strategy in high-performance UV PDs' design.
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