材料科学
三卤化物
钙钛矿(结构)
结晶
甲脒
钙钛矿太阳能电池
钝化
能量转换效率
光电子学
载流子寿命
薄脆饼
太阳能电池
光伏系统
图层(电子)
粒度
纳米技术
化学工程
硅
无机化学
复合材料
化学
卤化物
工程类
生物
生态学
作者
Yuqin Zou,Hao‐Yi Wang,Yujun Qin,Cheng Mu,Qi Li,Dongsheng Xu,Jianping Zhang
标识
DOI:10.1002/adfm.201805810
摘要
Abstract Organolead trihalide perovskite films with a large grain size and excellent surface morphology are favored to good‐performance solar cells. However, interstitial and antisite defects related trap‐states are originated unavoidably on the surfaces of the perovskite films prepared by the solution deposition procedures. The development of post‐growth treatment of defective films is an attractive method to reduce the defects to form good‐quality perovskite layers. Herein, a post‐treatment tactic is developed to optimize the perovskite crystallization by treating the surface of the one‐step deposited CH 3 NH 3 PbI 3 (MAPbI 3 ) using formamidinium iodide (FAI). Charge carrier kinetics investigated via time‐resolved photoluminescent, open‐circuit photovoltage decay, and time‐resolved charge extraction indicate that FAI post‐treatment will boost the perovskite crystalline quality, and further result in the reduction of the defects or trap‐states in the perovskite films. The photovoltaic devices by FAI treatment show much improved performance in comparison to the controlled solar cell. As a result, a champion solar cell with the best power conversion efficiency of 20.25% is obtained due to a noticeable improvement in fill factor. This finding exhibits a simple procedure to passivate the perovskite layer via regulating the crystallization and decreasing defect density.
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