Thermally induced recrystallization of MAPbI3 perovskite under methylamine atmosphere: an approach to fabricating large uniform crystalline grains

Abstract

A liquid to solid phase transition of methylammonium lead triiodide (MAPbI₃) under methylamine (MA) atmosphere at elevated temperatures was discovered, and used to form high quality and uniform thin films containing large, low defect crystal grains tens of microns in size.