材料科学
钝化
光电流
异质结
光伏系统
钙钛矿(结构)
晶界
活动层
能量转换效率
太阳能电池
磁滞
图层(电子)
扫描电子显微镜
光电子学
纳米技术
化学工程
复合材料
凝聚态物理
电气工程
工程类
物理
微观结构
薄膜晶体管
作者
Yi-Chuan Chen,Wencai Zhou,Xiaoqing Chen,Xiaobo Zhang,Hongli Gao,Nabonswendé Aïda Nadège Ouedraogo,Zilong Zheng,Chang Bao Han,Yongzhe Zhang,Hui Yan
标识
DOI:10.1002/adfm.202108417
摘要
Abstract As one of the most promising photovoltaic materials, the efficiency of inorganic–organic hybrid halide perovskite solar cells (PSCs) has reached 25.5% in 2020. However, the stability and hysteresis remain primary challenges before it can become a commercial photovoltaic technology. Therefore, those issues have drawn significant attention for photovoltaic applications. In this work, a study of the PSCs hysteresis improvement is presented based on a combination of first‐principles simulations, scanning electron microscopy images, and time‐dependent photocurrent measurements. It indicates the hysteresis led by the ion migration and accumulation is mainly localized at the two interfaces: one is between electron transport layer and active layer, and the other is between active layer and hole transport layer. Considering the massive defects at the grain boundaries (GBs), they lower the potential barriers significantly. The defect density at GBs is therefore reduced via the in situ passivation of PbI 2 crystals. The hysteresis index is decreased from 22.43% down to 1.04%, and results in an improvement in efficiency from 17.12% up to 20.10%. Following the understanding of defect‐induced hysteresis, an approach to improve the hysteresis is provided, which can be integrated into the fabrication process and widely applied to enhance the performance of PSCs.
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