The Effect of Methylammonium Iodide on the Supersaturation and Interfacial Energy of the Crystallization of Methylammonium Lead Triiodide Single Crystals. Issue 50 (23rd November 2017)

• Record Type: Journal Article
• Authors: Li, Bichen; Isikgor, Furkan H.; Coskun, Hikmet; Ouyang, Jianyong
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 50(2017)
• Page Start: 16073
• Page End: 16076
• Publication Date: 2017-11-23
• Subjects: crystallization -- growing planes -- interfacial energy -- methylammonium iodide -- perovskites; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201710234
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: It is very important to study the crystallization of hybrid organic–inorganic perovskites because their thin films are usually prepared from solution. The investigation on the growth of perovskite films is however limited by their polycrystallinity. In this work, methylammonium lead triiodide single crystals grown from solutions with different methylammonium iodide (MAI):lead iodide (PbI2 ) ratios were investigated. We observed a V‐shaped dependence of the crystallization onset temperature on the MAI:PbI2 ratio. This is attributed to the MAI effects on the supersaturation of precursors and the interfacial energy of the crystal growth. At low MAI:PbI2 ratio (<1.7), more MAI leads to the supersaturation of the precursors at lower temperature. At high MAI:PbI2 ratio, the crystal growing plans change from (100)‐plane dominated to (001)‐plane dominated. The latter have higher interfacial energy than the former, leading to a higher crystallization onset temperature. Abstract : Growing planes : The methylammonium iodide (MAI):PbI2 ratio significantly affects the supersaturation of precursors and the interfacial energy of the crystal growth. As a result, it has an effect on both the crystallization onset temperature (see picture) and the shape of perovskite single crystals.