A simple method for phase control in two-dimensional perovskite solar cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)18871-18876
Journal / PublicationJournal of Materials Chemistry A
Issue number39
Online published18 Sep 2018
Publication statusPublished - 21 Oct 2018


Two-dimensional (2D) A′2MAn-1PbnI3n+1 perovskites with n = 4 have attracted much attention recently and the low-n (e.g. n = 1) phases in these 2D perovskites have been found to act as carrier traps, leading to decreased performance. In this work, we demonstrate a simple method to suppress the formation of low-n phases by using dimethyl sulfoxide (DMSO) as a co-solvent. The present 2D perovskites with alternating cations in the interlayer space (ACI) exhibit enhanced carrier lifetime and charge transport by suppressing low-n phases. The optimized 2D ACI-based perovskite solar cell shows a PCE of 12.8%, which is also the highest efficiency for ACI-based perovskite solar cells, and is almost 3 times higher than that of the non-DMSO treated devices.