High Performance of Perovskite Solar Cells via Catalytic Treatment in Two-Step Process: The Case of Solvent Engineering
High Performance of Perovskite Solar Cells via Catalytic Treatment in Two-Step Process: The Case of Solvent Engineering
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通过两步法催化处理实现高性能钙钛矿太阳能电池：溶剂工程案例
DOI：
10.1021/acsami.6b09532
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发表时间：
2016-11-09
影响因子：
9.5
通讯作者：
Wang, Liduo
中科院分区：
文献类型：
--
作者：
Li, Wenzhe;Fan, Jiandong;Wang, Liduo
目前，两步溶液法制备混合阳离子钙钛矿薄膜(FA(x)MA（1-x)PbI(3)）的溶剂辅助结晶机理尚不清楚。本文阐明了NH2CH=NH2I （FAI）和CH3NH3I （MAI）与PbI2(DMSO)(x)配合物在二甲亚砜（DMSO）和乙醚（DE）催化溶剂体系中连续两步溶液反应的分子竞争过程。通过原位光致发光光谱表征了钙钛矿薄膜的微观动力学特性。此外，我们发现高沸点残余溶剂（如DMSO）影响了钙钛矿薄膜的热稳定性。进一步的DE处理可以促进DMSO的挥发过程，加速钙钛矿膜的结晶过程。可重复性FA(0.88)MA(0.12)PbI(3)太阳能电池的PCE最高可达19%以上，且具有轻微的滞后效应，在光浸泡后1-00 s内输出恒定功率，在热稳定性测试中30 d内输出稳定PCE。
Currently, the potential mechanism of the solvent-assisted crystallization for mixed cations perovskite thin film (FA(x)MA(1-x)PbI(3)) prepared via two-step solution-process still remains obscure. Here, we clarified the molecular-competing-reacted process of NH2CH=NH2I (FAI) and CH3NH3I (MAI) with PbI2(DMSO)(x) complex in dimethyl sulfoxide (DMSO) and diethyl ether (DE) catalytic solvent system in the sequential two-step solution-process. The microscopic dynamics was characterized via the characterizations of in situ photoluminescence spectra, In addition, we found that the thermal stability of the perovskite films suffered from the residual solvent with high boiling point, for example, DMSO. The further DE treatment could promote the volatility process of DMSO and accelerate the crystallization process of perovskite films. The highest PCE over 19% with slight hysteresis effect was eventually obtained with a reproducible FA(0.88)MA(0.12)PbI(3) solar cell, which displayed a constant power output within 1-00 s upon light soaking and stable PCE output within 30 d in the thermal stability test.