期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 22, 页码 19994-20003出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03622
关键词
all-inorganic perovskite; CsPbI2Br; niobium doping; phase stability; carbon electrode
资金
- KAKENHI, Japan [15105597]
- Takahashi Industrial and Economic Research Foundation (Takahashi grant) [06-003-154]
- National Natural Science Foundation of China [51772039]
- Research Center for Solar Light Energy Conversion, Kyushu Institute of Technology
All-inorganic perovskites are attracting increasing attention due to their superior thermal stability than that of the traditional CH3NH3PbI3, while their inferior phase stability in ambient conditions is still an unsolved issue. Here, for the first time, we report the incorporation of niobium (Nb5+) ions into the CsPbI2Br perovskite. Results indicate that Nb5+ can effectively stabilize the photoactive alpha-CsPbI2Br phase by the possible substitution of Pb2+. With 0.5% Nb doping, the carbon electrode-based all-inorganic perovskite solar cells achieved a high photoconversion efficiency value of 10.42%, 15% higher than that of the control device. The Nb5+ incorporation reduces the charge recombination in the perovskite, leading to a champion V-oc value of 1.27 V and a negligible hysteresis effect. This work explicates the high compatibility of all-inorganic perovskite materials and unlocks the opportunities for the use of high-valence ions for perovskite property modification.
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