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Moisture-Induced Crystallinity Improvement for Efficient CsPbI

Moisture-Induced Crystallinity Improvement for Efficient CsPbI

Zhenzhen Li, Xiaolong Liu, Jia Xu, Yinjie Liao, Hang Zhao, Bing Zhang, Shengzhong Frank Liu, Jianxi Yao

J Phys Chem Lett. 2019 Aug 15;10(16):4587-4595.

PMID: 31359754

Abstract:

All-inorganic perovskite materials emerge to be potential promising candidates for photoelectric applications. However, their instability to moisture has seriously limited future applications. It is imperative to develop new fabrication methods to make the perovskite films moisture-tolerant. In this work, it is demonstrated that both crystallinity and photoelectronic performance of the CsPbI3-xBrx (x < 1) perovskite were enhanced with the existence of excess CsBr and employing moisture treatment. An intermediate product of CsI1-yBry/CsPbI3-xBrx was obtained by using an extra amount of CsBr, and the structural evolution toward a uniform CsPbI3-zBrz layer (as the Br- incorporation, the mole ratio increases from x to z) was initiated by moisture treatment, forming new (PbX6)4- octahedra with the bonding of CsI1-yBry to Pb2+. Attributed to the homogeneity of the stoichiometry and crystallinity, the photovoltaic performance of the moisture-treated perovskite films was improved, with the open-circuit voltage increased from 0.97 to 1.10 V and the power conversion efficiency from 10.89 to 13.09%.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7787691	Cesium bromide		7787-69-1	Price

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