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摘要：Unlike traditional MAPbI3, methods for large scale fabrication ::H:of:H:: high quality FA based perovskite films are still lacking. In this paper, the organic cation exchange temperature is optimized toward the formation ::H:of:H:: 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-xPbI3with x ≈ 0.75 presents the highest efficiency ::H:of:H:: 15.5% with less hysteresis. © 2016 The Royal Society ::H:of:H:: Chemistry.

卷号：4

期号：37

是否译文：否