CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences , 588 Heshuo Road, Shanghai 201899, P. R. China.
University of Chinese Academy of Sciences , Beijing 100039, P. R. China.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):3667-3676. doi: 10.1021/acsami.6b14270. Epub 2017 Jan 18.
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.
大多数在之前的研究中使用的抗溶剂与钙钛矿前驱体溶液混溶。即使存在中间阶段，它们也总是导致钙钛矿的快速形成，这不利于获得高质量的钙钛矿薄膜，并使形成过程更难控制。在这项工作中，使用了一种新型的乙醚/正己烷混合抗溶剂（MAS）来实现高成核密度和减缓钙钛矿的形成过程，从而产生具有改进晶粒取向和超光滑表面的薄膜。这些高质量的薄膜在钙钛矿/空穴传输材料界面表现出高效的电荷传输，基于这些薄膜的钙钛矿太阳能电池的性能得到了极大的提高，最佳功率转换效率达到了 17.08%。这项工作还提出了 MAS 的选择原则，并表明通过设计混合抗溶剂体系进行溶剂工程可以导致高性能钙钛矿太阳能电池的制造。
