Formamidinium-based Ruddlesden–Popper perovskite films fabricated via two-step sequential deposition: quantum well formation, physical properties and film-based solar cells. Issue 3 (26th January 2022)

• Record Type: Journal Article
• Authors: Lu, Jing; Yang, Tinghuan; Niu, Tianqi; Bu, Nuo; Zhang, Yalan; Wang, Shiqiang; Fang, Junjie; Chang, Xiaoming; Luo, Tao; Wen, Jialun; Yang, Yingguo; Ding, Zicheng; Zhao, Kui; Liu, Shengzhong (Frank)
• Is Part Of: Energy & environmental science. Volume 15:Issue 3(2022)
• Page Start: 1144
• Page End: 1155
• Publication Date: 2022-01-26
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d1ee02851k
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : We demonstrate an inclusive study on the growth, properties and application in solar cells of FA-based Ruddlesden–Popper type perovskites M2 FA n −1 Pb n I3 n +1 (M = benzylamine (PMA) or FA) fabricated via two-step sequential deposition. Abstract : The use of layered perovskites is an important strategy to stabilize a formamidinium (FA) based photoactive α-FAPbI3 phase. However, the growth mechanism of FA-based layered perovskites and its influence on their physical properties have not yet been reported. Herein, we demonstrate an inclusive study on the growth, structure and optoelectronic properties of FA-based Ruddlesden–Popper (RP) type perovskites M2 FA n −1 Pb n I3 n +1 (M = benzylamine (PMA) or FA) during two-step sequential deposition, revealing the transformation of dominant layered perovskites from PMA2 FA n −1 Pb n I3 n +1 to novel FA2 FA n −1 Pb n I3 n +1 with increasing FA : PMA ratios in precursors, and increased n values from top to bottom for the former case while a uniform distribution for the latter case. Moreover, we investigated the charge transport kinetics between quantum wells and illustrate the application of these structures in perovskite solar cells with a power conversion efficiency that exceeds 19%, accompanied by enhanced film stability in contrast to 3D analogs.