期刊
SOLAR RRL
卷 2, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800164
关键词
compositional engineering; inorganic perovskite solar cells; lattice contraction; perovskite layer; stability
资金
- National Natural Science Foundation of China [61774139, 21503202, 61604143]
- Qingdao National Laboratory for Marine Science and Technology [QNLM201702]
The crystal structure of cesium lead halide (CsPbX3, X=I, Br, Cl) determines its charge-carrier trap state and solar-to-electrical conversion ability in inorganic perovskite solar cells (PSCs). Here, the compositional engineering of inorganic CsPbBr3 perovskite by means of doping with various alkali metal cations is studied. The lattice dimensions and energy levels of Cs1-xRxPbBr3 (R=Li, Na, K, Rb, x=0-1) halides are optimized by tuning Cs/R ratio. Arising from promoting effects of alkali metal cations doped perovskite halides such as lattice shrink, crystallized dynamics, and electrical-energy distribution, a maximum power conversion efficiency as high as 9.86% is achieved for hole transporting layer-free Cs0.91Rb0.09PbBr3 tailored solar cell owing to the suppressed non-radiative losses and radiative recombination. Furthermore, the all-inorganic Cs0.91Rb0.09PbBr3 solar cell without encapsulation remains 97% of initial efficiency when suffering persistent attack by 80% RH in air atmosphere over 700h, which is in comparable with state-of-the-art organic-inorganic hybrid and all-inorganic PSC devices. Employing alkali metal cations to modulate perovskite layers provide new opportunities of making high-performance inorganic PSC platforms.
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