钙钛矿(结构)
分子间力
化学
结晶
二甲基亚砜
能量转换效率
薄膜
分子内力
化学工程
二甲基甲酰胺
材料科学
溶剂
太阳能电池
钙钛矿太阳能电池
光电子学
形态学(生物学)
制作
光伏系统
纳米技术
高分子化学
结晶学
有机化学
分子
工程类
生物
遗传学
作者
Wenzhe Li,Jiandong Fan,Jiangwei Li,Jie Lin,Liduo Wang
摘要
The highly developed crystallization process with respect to perovskite thin films is favorable for efficient solar cells. Here, an innovative intermolecular self-assembly approach was employed to retard the crystallization of PbI2 in dimethylformamide (DMF) by additional solvent of dimethyl sulfoxide (DMSO), which was proved to be capable of coordinating with PbI2 by coordinate covalent bond. The obtained PbI2(DMSO)x (0 ≤ x ≤ 1.86) complexes tend to be closely packed by means of intermolecular self-assembly. Afterward, an intramolecular exchange of DMSO with CH3NH3I (MAI) enabled the complexes to deform their shape and finally to reorganize to be an ultraflat and dense thin film of CH3NH3PbI3. The controllable grain morphology of perovskite thin film allows obtaining a power conversion efficiency (PCE) above 17% and a stabilized power output above 16% within 240 s by controlling DMSO species in the complex-precursor system (CPS). The present study gives a reproductive and facile strategy toward high quality of perovskite thin films and efficient solar cells.
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