(111)-Dominated Perovskite Films by Antisolvent Engineering

Xiangyu Sun, Dongni Li, Lu Zhao, Yao Zhang, Qin Hu, Thomas P. Russell, Fangze Liu, Jing Wei*, Hongbo Li*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

33 引用 (Scopus)

摘要

Fabricating perovskite films with a dominant crystal orientation is an effective path to realizing quasi-single-crystal perovskite film, which can eliminate the fluctuation of the electrical properties in films arising from grain-to-grain variations, and improve the performance of perovskite solar cells (PSCs). Perovskite (FAPbI3) films based on one-step antisolvent methods usually suffer from chaotic orientations due to the inevitable intermediate phase conversion from intermediates of PbI2•DMSO, FA2Pb3I8•4DMSO, and δ-FAPbI3 to α-FAPbI3. Here, a high-quality perovskite film with (111) preferred orientation ((111)-α-FAPbI3) using a short-chain isomeric alcohol antisolvent, isopropanol (IPA) or isobutanol (IBA), is reported. The interaction between IPA and PbI2 leads to a corner-sharing structure instead of an edge-sharing PbI2 octahedron, sidestepping the formation of these intermediates. With the volatilization of IPA, FA+ can replace IPA in situ to form α-FAPbI3 along the (111) direction. Compared to randomly orientated perovskites, the dominantly (111) orientated perovskite ((111)-perovskite) exhibits improved carrier mobility, uniform surface potential, suppressed film defects and enhanced photostability. PSCs based on the (111)-perovskite films show 22% power conversion efficiency and excellent stability, which remains unchanged after 600 h continuous working at maximum power point, and 95% after 2000 h of storage in atmosphere environment.

源语言英语
文章编号2301115
期刊Advanced Materials
35
28
DOI
出版状态已出版 - 13 7月 2023

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