材料科学
光电流
钙钛矿(结构)
溶解
化学工程
相(物质)
能量转换效率
钙钛矿太阳能电池
溶解过程
溶剂
太阳能电池
单晶
化学稳定性
Crystal(编程语言)
结晶学
有机化学
化学
光电子学
程序设计语言
工程类
计算机科学
作者
Gwang Su Shin,Yong Zhang,Nam‐Gyu Park
标识
DOI:10.1021/acsami.9b23086
摘要
We report here on the stability of a precursor solution for perovskite solar cells. Solution was aged at ambient conditions for 4 weeks, where two different precursor solutions were prepared by dissolving FAI and PbI2 in DMSO/DMF solvent (precursor mixture solution) and the synthesized single crystalline α-FAPbI3 in the same solvent (single crystal solution). Perovskite films were prepared by depositing fresh or aged solutions at weekly intervals. Photovoltaic parameters were hardly altered by aging the single crystal solution, while power conversion efficiency was gradually decreased with aging time for the precursor mixture solution mainly due to the decreased photocurrent density and fill factor. Solution pH was changed from basic to acidic due to HI formed by aging the precursor mixture solution, which prevents the formation of α-phase of FAPbI3. For the single crystal solution, basic conditions remained unchanged by aging. In addition, the presence of δ-phase in the annealed perovskite films was found to have negative influence on the long-term stability. It is thus important to maintain the pH of the precursor solution to avoid aging effects and remove δ-phase in the annealed film for device stability.
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