期刊
ELECTROCHIMICA ACTA
卷 330, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135325
关键词
All-inorganic perovskite solar cell; Flux synthesis; CsPbIBr2 film; Low temperature; High efficiency
资金
- National Natural Science Foundation of China [61804113, 61874083]
- Initiative Postdocs Supporting Program of China [BX20190261]
- National Natural Science Foundation of Shaanxi Province [2018ZDCXL-GY-08-02-02, 2017JM6049]
- Fundamental Research Funds for the Central Universities of China [JB181107, JBX171103]
Flux-mediated crystal growth strategy is highlighted by its feasibility of low-temperature, fast growth of high-quality metal oxides, as a result of enhanced diffusion of reactants. Herein, this strategy is successfully extended for CsPbIBr2 film for the first time by simply incorporating a certain amount of CH3NH3Br into the precursor film. The CH3NH3Br species served as flux agents could dramatically boost the growth and coarsening of CsPbIBr2 grains. Hence, a dense and uniform CsPbIBr2 film consisted of micro-sized and high-crystallinity grains is attained at a low temperature of 200 degrees C. This processing temperature is lowered by one-third in contrast to the previous methods. More importantly, the carbon-based, all-inorganic perovskite solar cell (PSC) based on such desired CsPbIBr2 film yields an optimized efficiency of 10.82%, which stands a record-high value for CsPbIBr2-based PSCs without configuration modifications. Meanwhile, the PSC delivers excellent operation stability under light, thermal, and humidity stresses. Consequently, the work contributes to establish a facile approach to low-temperature preparation of high-quality CsPbIBr2 film for development of practical and efficient PSCs. (C) 2019 Elsevier Ltd. All rights reserved.
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