The effect of solvent composition on stability and performance of CsPbIBr2

Published: 10 November 2021| Version 1 | DOI: 10.17632/j9p2zz849v.1
Contributor:
Alexander Wyn Stewart

Description

Summary: One-step spin coated CsPbIBr2 films, made with three different precursor solutions in order to investigate the effect of solvent composition on the processed film. Hypothesis: The best results will be obtained when the ratio of DMF to DMSO is equal to the ratio of iodine to bromine (1:2). Highlights: - Hypotheis supported, the film where the solvent mixture was made up of 67% DMSO and 33% DMF outperformed all other films when fresh. - The film where only DMSO was used showed higher stability when aged.

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Steps to reproduce

0.5M solutions of CsPbIBr2 were prepared by dissolving equimolar ratios of CsI and PbBr2 in different mixtures of DMSO and DMF at 95°C for 90 minutes. Once a given solution was ready, 50µL of precursor solution was statically spin-coated onto the substrates at 4000RPM for 50 seconds. A two-step annealing procedure was employed where samples were held at 50°C and 250°C for 5 minutes respectively. To probe their stability, all the samples were stored in the laboratory, at 24°C and with a relative humidity of 50%, for 120 hours.

Institutions

Universitat Politecnica de Valencia

Categories

Thin Film, Perovskites, Crystal Structure of Perovskites, Synthesis of Perovskites, Thin Film Characterization, Perovskite Solar Cell

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