Controllable Grain Morphology of Perovskite Absorber Film by Molecular Self-Assembly toward Efficient Solar Cell Exceeding 17%,Journal of the American Chemical Society

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Controllable Grain Morphology of Perovskite Absorber Film by Molecular Self-Assembly toward Efficient Solar Cell Exceeding 17%
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2015-08-06 , DOI: 10.1021/jacs.5b06444
Wenzhe Li ₁ , Jiandong Fan ₂ , Jiangwei Li ₁ , Yaohua Mai ₂ , Liduo Wang ₁

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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.

中文翻译：

通过分子自组装实现钙钛矿吸收膜的可控晶粒形貌实现超过 17% 的高效太阳能电池

钙钛矿薄膜高度发达的结晶过程有利于高效太阳能电池。在这里，采用创新的分子间自组装方法，通过添加二甲基亚砜 (DMSO) 的额外溶剂来延缓二甲基甲酰胺 (DMF) 中 PbI2 的结晶，事实证明，二甲基亚砜 (DMSO) 能够通过配位共价键与 PbI2 配位。获得的 PbI2(DMSO)x (0 ≤ x ≤ 1.86) 配合物倾向于通过分子间自组装紧密堆积。之后，DMSO 与 CH3NH3I（MAI）的分子内交换使配合物变形，最终重组为超平坦且致密的 CH3NH3PbI3 薄膜。通过控制复合前驱体系统 (CPS) 中的 DMSO 物质，钙钛矿薄膜的可控晶粒形态允许在 240 秒内获得高于 17% 的功率转换效率 (PCE) 和高于 16% 的稳定功率输出。本研究为高质量钙钛矿薄膜和高效太阳能电池提供了一种可再生且简便的策略。

更新日期：2015-08-06

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