Ultrasmooth Perovskite Film via Mixed Anti-Solvent Strategy with Improved Efficiency.
Ultrasmooth Perovskite Film via Mixed Anti-Solvent Strategy with Improved Efficiency.
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DOI：
10.1021/acsami.6b14270
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发表时间：
2017-01
影响因子：
9.5
通讯作者：
Yu Yu-Yu;Songwang Yang;Lei Lei-Lei;Qipeng Cao;J. Shao;Sheng Zhang;Yan Liu
中科院分区：
文献类型：
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作者：
Yu Yu-Yu;Songwang Yang;Lei Lei-Lei;Qipeng Cao;J. Shao;Sheng Zhang;Yan Liu
以往研究中使用的大多数抗溶剂剂与钙钛矿前驱体溶液都是相容的。即使存在中间阶段，它们也会导致钙钛矿相的快速形成，这不利于获得高质量的钙钛矿薄膜，并且使形成过程变得更难控制。本工作采用新型的乙醚/正己烷混合抗溶剂(MAS)来实现高成核密度和减缓钙钛矿相的形成过程，从而获得具有更好的颗粒取向和超光滑表面的薄膜。这些高质量的薄膜在钙钛矿/空穴传输材料和基于这些薄膜的钙钛矿太阳能电池的界面上表现出了有效的电荷传输，性能得到了极大的提高，最高的功率转换效率为17.08%。本工作还提出了MAS的选择原则，并表明通过设计混合抗溶剂体系的溶剂工程可以制备高性能的钙钛矿型太阳能电池。
Most antisolvents employed in previous research were miscible with perovskite precursor solution. They always led to fast formation of perovskite even if the intermediate stage existed, which was not beneficial to obtain high quality perovskite films and made the formation process less controllable. In this work, a novel ethyl ether/n-hexane mixed antisolvent (MAS) was used to achieve high nucleation density and slow down the formation process of perovskite, producing films with improved orientation of grains and ultrasmooth surfaces. These high quality films exhibited efficient charge transport at the interface of perovskite/hole transport material and perovskite solar cells based on these films showed greatly improved performance with the best power conversion efficiency of 17.08%. This work also proposed a selection principle of MAS and showed that solvent engineering by designing the mixed antisolvent system can lead to the fabrication of high-performance perovskite solar cells.