期刊
ADVANCED SCIENCE
卷 7, 期 11, 页码 -出版社
WILEY
DOI: 10.1002/advs.201903662
关键词
double perovskite films; selective detection; sequential vapor deposition; ultraviolet photodetectors
资金
- National Key R&D Program of China [2017YFA0207400]
- National Natural Science Foundation of China [61604032]
- Special Program for Sichuan Youth Science and Technology Innovation Research Team [2019JDTD0006]
- Fundamental Research Funds for the Central Universities of China [ZYGX2016J206]
Double perovskites have shown great potentials in addressing the toxicity and instability issues of lead halide perovskites toward practical applications. However, fabrication of high-quality double perovskite thin films has remained challenging. Here, sequential vapor deposition is used to fabricate high-quality Cs2AgBiCl6 perovskite films with balanced stoichiometry, superior morphology, and highly oriented crystallinity, with an indirect bandgap of 2.41 eV. Using a diode structure, self-powered Cs2AgBiCl6 ultraviolet (UV) photodetectors are demonstrated with high selectivity centered at 370 nm, with low dark current density (approximate to 10(-7) mA cm(-2)), high photoresponsivity (approximate to 10 mA W-1), and detectivity (approximate to 10(12) Jones). Its detectivity is among the highest in all double-perovskite-based photodetectors reported to date and surpassing the performance of other perovskite photodetectors as well as metal oxide in the UV range. The devices also show excellent environmental and irradiation stability comparable to state-of-the-art UV detectors. The findings help pave the way toward application of double perovskites in optoelectronic devices.
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