Zuo Chuantian, Ding Liming
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, China.
Angew Chem Int Ed Engl. 2021 May 10;60(20):11242-11246. doi: 10.1002/anie.202101868. Epub 2021 Apr 8.
Drop-casting was used to make MAPbI films for solar cells. The crystal growth in drop-cast MAPbI films was regulated by adjusting temperature. A mechanism for the formation of different morphology was proposed by combining in situ crystal-growth study with XRD measurements. The crystals in the films made at low temperature (60 °C) and high temperature (≥120 °C) are (110) and (200) oriented, respectively. The different crystal growth mode leads to quite different film morphology. Compared with spin-coating, drop-casting shows much better tolerance to humidity. MAPbI solar cells made under 88 % humidity delivered a PCE of 18.17 %, which is the highest PCE for perovskite solar cells made under >70 % humidity without antisolvent assistance.
采用滴铸法制备用于太阳能电池的MAPbI薄膜。通过调节温度来调控滴铸MAPbI薄膜中的晶体生长。结合原位晶体生长研究和XRD测量，提出了不同形貌形成的机制。在低温（60 °C）和高温（≥120 °C）下制备的薄膜中的晶体分别为（110）和（200）取向。不同的晶体生长模式导致薄膜形貌差异很大。与旋涂法相比，滴铸法对湿度的耐受性要好得多。在88 %湿度条件下制备的MAPbI太阳能电池的光电转换效率（PCE）为18.17 %，这是在无反溶剂辅助的情况下，湿度>70 %时制备的钙钛矿太阳能电池的最高PCE。
