A balanced cation exchange reaction toward highly uniform and pure phase FA1−xMAxPbI3 perovskite films
- 22 August 2016
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry A
- Vol. 4 (37), 14437-14443
- https://doi.org/10.1039/c6ta05727f
Abstract
Unlike traditional MAPbI3, methods for large scale fabrication of high quality FA based perovskite films are still lacking. In this paper, the organic cation exchange temperature is optimized toward the formation of highly uniform FA based perovskite films. Under optimized conditions, the cation diffusion speed within the perovskite film is extremely enhanced and the time constant is reduced ∼20 times. The shortened dipping time and mild reaction conditions can efficiently restrict the undesirable phase transition and preserve the film morphology. Fundamental insight into this solid–liquid reaction has been obtained by combining photophysical, XRD and SEM characterizations. The optimized FAxMA1−xPbI3 with x ≈ 0.75 presents the highest efficiency of 15.5% with less hysteresis.Keywords
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