Controllable Grain Morphology of Perovskite Absorber Film by Molecular Self-Assembly toward Efficient Solar Cell Exceeding 17%

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• 作者：Wenzhe Li ; Jiandong Fan ; Jiangwei Li ; Yaohua Mai ; Liduo Wang
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：137
• 期：32
• 页码：10399-10405
• 全文大小：522K
• ISSN：1520-5126

文摘

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 鈮?x 鈮?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鈥損recursor system (CPS). The present study gives a reproductive and facile strategy toward high quality of perovskite thin films and efficient solar cells.