光电流
钙钛矿(结构)
掺杂剂
兴奋剂
化学物理
密度泛函理论
离子
材料科学
光电子学
化学
化学工程
纳米技术
计算化学
工程类
有机化学
作者
Fu Zhang,Xin Sun,Haonan Xie,Xudong Cai,Bo Zheng,Hua Yu,Enzuo Liu,Xiaojing Hao,Meng Zhang
标识
DOI:10.1021/acs.chemmater.1c03237
摘要
Despite the remarkable advances of inorganic perovskite solar cells (PSCs) by extrinsic metal doping, the doping mechanism and physical location of doping ions are still ambiguous. Herein, the ion-migration behavior of inorganic PSCs is studied theoretically and experimentally for Sm-doped CsPbI2Br perovskites. The structural characterizations and density functional theory (DFT) calculation confirm the interstitial occupancy of the dopant Sm in the CsPbI2Br perovskite lattice. The ion-migration behavior was systematically unveiled by employing multiple photoelectrochemical techniques. The results show that with Sm interstitial doping in the CsPbI2Br perovskite, the operational stability of PSCs is dramatically improved owing to effectively suppressed ion migration, demonstrated by alleviated VOC change at different scan rates, weaker response to electric poling, faster photocurrent response, higher activation energy of mobile ions, and much more stable maximum power point (MPP) tracking performance. With theoretical model-supported experimental investigation, this research unravels the mechanism of ion-migration suppression in CsPbI2Br PSCs by interstitial doping. This may pave the way to achieve operational stability of PSCs through facile cost-effective practice.
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