期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 7, 页码 6414-6421出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00154
关键词
direct molecule substitution; CsPbBr3 film; two-step dipping method; solar energy materials; perovskite solar cell
资金
- National Key Research and Development Program of China [2018YFA0209303, 2020YFA0710302]
- National Natural Science Foundation of China [U1663228, 51902153, 51972165]
A wet PbBr2(DMF) precursor film was proposed for rapid formation of CsPbBr3 films, improving phase purity, surface coverage, and crystallinity. The best-performance planar carbon-based CsPbBr3 perovskite solar cell achieved a power conversion efficiency of 5.25%, a boost of approximately 100% compared to traditional methods.
Owing to the solubility limitation of the bromide ion, a two-step dipping method was mostly used to prepare CsPbBr3 films. However, the commonly used well-crystallized PbBr2 precursor film is too compact for the diffusion of CsBr solution. Inconvenient conversion resulted in CsPbBr3 films with poor phase purity. Additionally, long immersion time in solution made films suffer from destructive decomposition. Herein, a wet PbBr2(DMF) precursor film was proposed to rapidly form the CsPbBr3 film. A direct molecule substitution between the DMF (N,N-dimethylformamide) ligand and CsBr promotes the conversion, which was experimentally proved by Fourier transform infrared spectroscopy. Phase purity, surface coverage, and crystallinity of final CsPbBr3 films were improved. The best-performance planar carbon-based CsPbBr3 perovskite solar cell (PSC) obtained with a wet PbBr2(DMF) film showed a power conversion efficiency (PCE) of 5.25%. Compared with the optimized PSC assembled using CsPbBr3 obtained with a well-crystallized PbBr2 film, which has a PCE of 2.64%, the PCE was boosted by similar to 100%.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据