碘化物
能量转换效率
退火(玻璃)
钙钛矿(结构)
蒸发
热稳定性
材料科学
化学工程
纳米技术
化学
光电子学
无机化学
物理
气象学
冶金
工程类
作者
Siyang Wang,Liguo Tan,Junjie Zhou,Minghao Li,Xing Zhao,Hang Li,Wolfgang Tress,Liming Ding,Michael Gräetzel,Chenyi Yi
出处
期刊:Joule
[Elsevier]
日期:2022-06-01
卷期号:6 (6): 1344-1356
被引量:66
标识
DOI:10.1016/j.joule.2022.05.002
摘要
Summary
Methylammonium (MA)-free perovskites such as CsxFA1−xPbX3 (CsFA) show excellent thermal stability, favoring their use in perovskite solar cells (PSCs). However, the power conversion efficiency (PCE) of CsFA lags behind that of MA-containing formulations due to the difficulty in controlling the film morphology. Herein, we report innovative morphology engineering using solution deposition of a mixture of CsBr, PbI2, and PbCl2 followed by vacuum evaporation of formamidinium iodide (FAI) to fabricate CsFA films. The introduction of a chloride precursor leads to larger grain sizes, forming a high-quality CsFA film under annealing. This enables the realization of robust CsFA-based PSCs with the highest reported PCE up to 24.1% (certified 23.9%) for 0.1 cm2 and 22.8% for 1 cm2 devices. Moreover, the unencapsulated evaporation device shows excellent stability with negligible efficiency decline after 20,000 h of storage in dry air or 1,000 h of exposure to 50% humidity, which is much better than the device prepared using the solution procedure.
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