Issue 44, 2022

Evaluation of surface passivating solvents for single and mixed halide perovskites

Abstract

Surface passivation is one of the commonly used approaches to reduce the density of defects on the surfaces and interfaces hindering the performance and stability of perovskite optoelectronic devices. Although surface passivation leads to performance improvement for the targeted devices, details of the complex intermolecular interactions occurring between the molecules and perovskites are not entirely known. Here, we investigated a variety of commonly used solvents in the post-processing of perovskites by using photoluminescence (PL) spectroscopy on single and mixed halide perovskites (MAPbI3, MAPbBr3 and MAPb(Br0.5I0.5)3). Our results show that solvents with medium and low Gutmann donor and acceptor numbers provide PL intensity increase for both single halide perovskites by passivating the surface defect sites. Among the single halide perovskites, MAPbBr3 is more attracted to hydrogen bonding solvents, in contrast to MAPbI3 that is preferred by Lewis bases. This halide selective attraction also has an influence on the mixed-halide composition. Identifying these interaction mechanisms provides new insights into passivating the surface of perovskites for future device design.

Graphical abstract: Evaluation of surface passivating solvents for single and mixed halide perovskites

Supplementary files

Article information

Article type
Paper
Submitted
11 Jul 2022
Accepted
26 Sep 2022
First published
11 Oct 2022
This article is Open Access
Creative Commons BY license

RSC Adv., 2022,12, 28853-28861

Evaluation of surface passivating solvents for single and mixed halide perovskites

M. D. Özeren, Á. Pekker, K. Kamarás and B. Botka, RSC Adv., 2022, 12, 28853 DOI: 10.1039/D2RA04278A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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