材料科学
结晶度
钙钛矿(结构)
能量转换效率
傅里叶变换红外光谱
结晶
粒度
晶界
化学工程
钙钛矿太阳能电池
动力学
光电子学
降级(电信)
纳米技术
微观结构
复合材料
电子工程
工程类
物理
量子力学
作者
Jiangshan Feng,Xuejie Zhu,Zhou Yang,Xiaorong Zhang,Jinzhi Niu,Kai Wang,Shengnan Zuo,Shashank Priya,Shengzhong Liu,Dong Yang
标识
DOI:10.1002/adma.201801418
摘要
Abstract Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F‐PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F‐PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb 2+ to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F‐PSCs. Meanwhile, the environmental stability of the F‐PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F‐PSCs for practical applications.
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