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The Effect of Methylammonium Iodide on the Supersaturation and Interfacial Energy of the Crystallization of Methylammonium Lead Triiodide Single Crystals
Author(s) -
Li Bichen,
Isikgor Furkan H.,
Coskun Hikmet,
Ouyang Jianyong
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201710234
Subject(s) - supersaturation , triiodide , crystallization , iodide , crystal growth , perovskite (structure) , crystallography , chemistry , materials science , chemical engineering , inorganic chemistry , organic chemistry , electrode , dye sensitized solar cell , electrolyte , engineering
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 (PbI 2 ) ratios were investigated. We observed a V‐shaped dependence of the crystallization onset temperature on the MAI:PbI 2 ratio. This is attributed to the MAI effects on the supersaturation of precursors and the interfacial energy of the crystal growth. At low MAI:PbI 2 ratio (<1.7), more MAI leads to the supersaturation of the precursors at lower temperature. At high MAI:PbI 2 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.