期刊
CHEMPHYSCHEM
卷 17, 期 15, 页码 2382-2388出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201600230
关键词
electrochemistry; perovskite phases; solar cells; thin films; vapor-assisted solution deposition
资金
- Sharif Solar group
There have been recent reports on the formation of single-halide perovskites, CH3NH3PbX3 (X=Cl, Br, I), by means of vapor-assisted solution processing. Herein, the successful formation of mixed-halide perovskites (CH3NH3PbI3-xXx) by means of a vapor-assisted solution method at ambient atmosphere is reported. The perovskite films are synthesized by exposing PbI2 film to CH3NH3X (X=I, Br, or Cl) vapor. The prepared perovskite films have uniform surfaces with good coverage, as confirmed by SEM images. The inclusion of chlorine and bromine into the structure leads to a lower temperature and shorter reaction time for optimum perovskite film formation. In the case of CH3NH3PbI3-xClx, the optimum reaction temperature is reduced to 100 degrees C, and the resulting phases are CH3NH3PbI3 (with trace Cl) and CH3NH3PbCl3 with a ratio of about 2:1. In the case of CH3NH3PbI3-xBrx, single-phase CH3NH3PbI2Br is formed in a considerably shorter reaction time than that of CH3NH3PbI3. The mesostructured perovskite solar cells based on CH3NH3PbI3 films show the best optimal power conversion efficiency of 13.5%, whereas for CH3NH3PbI3-xClx and CH3NH3PbI3-xBrx the best recorded efficiencies are 11.6 and 10.5%, respectively.
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