New insight into solvent engineering technology from evolution of intermediates via one-step spin-coating approach  

一步旋涂法中反溶剂对中间相演变的新视角（英文）

作　　者：任英科 段滨 徐亚峰 黄阳 李兆乾 胡林华 Tasawar Hayat 王红霞 朱俊 戴松元 

机构地区：[1]Beijing Key Laboratory of Novel Thin-Film Solar Cells, North China Electric Power University, Beijing 102206, China [2]Key Laboratory of Novel Thin-Film Solar Cells, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China [3]NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, leddah 21589, Saudi Arabia [4]School of Chemistry, Physics and Mechanical Engineering Queensland University of Technology, Brisbane QLD 4001, Australia

出　　处：《Science China Materials》2017年第5期392-398,共7页中国科学（材料科学（英文版）

基　　金：supported by the National Basic Research Program of China (2016YFA0202400 and 2015CB932200);the National Natural Science Foundation of China (21403247);the External Cooperation Program of BIC, Distinguished Youth Foundation of Anhui Province (1708085J09);Chinese Academy of Sciences (GJHZ1607);STS project of Chinese Academy of Sciences (KFJ-SW-STS-152)

摘　　要：The anti-polar solvent technique is an effec- tive way to improve the film quality in a perovskite solar cell. In this work, we reveal the reason why chloroben- zene （CBZ） plays an important role in controlling the crystallization process. By investigating the formation of intermediate phases in the precursor solution, we observed that the CH3NH3I （MAI）-PbI2-dimethylformamide （DMF） or MAI-PbI2-dimethylsulphoxide （DMSO） adducts have not yet formed until washed with non-polar solvent. The accelerated formation of intermediate phase yields high crystalline perovskite layers. Rapid solvent evaporation and retarded perovskite crystallization in one-step method are efficient to obtain high-quality perovskite films. Conse- quently, MAI-PbI2-DMSO intermediate shows neat rod-like structure with high crystallinity, which eventually transforms extremely dense and uniform perovskite films.反溶剂技术可以有效改善钙钛矿薄膜的质量.本文揭示了氯苯(CBZ)在结晶过程中起的重要作用.通过研究前体溶液中配合物的结构变化,我们观察到,在滴加反溶剂之前,MAI-PbI_2-DMF或MAI-PbI_2-DMSO尚未形成.快速去除多余溶剂后形成中间相,延缓钙钛矿结晶是得到高质量钙钛矿薄膜的关键.其中MAI-PbI_2-DMSO中间体表现出了高结晶的棒状结构,因此最终转变成非常致密和均匀的钙钛矿薄膜.

关 键 词：perovskite solar cell rapid-transformation interme-diate phases anti-polar solvent technique 

分 类 号：TM914.4[电气工程—电力电子与电力传动]