We report the fractions of coexisting phases in a polycrystalline CH3NH3PbI3 at room temperature. By a quantitative analysis of a selected-area electron diffraction pattern, we identified that the fractions of… Click to show full abstract
We report the fractions of coexisting phases in a polycrystalline CH3NH3PbI3 at room temperature. By a quantitative analysis of a selected-area electron diffraction pattern, we identified that the fractions of tetragonal and cubic phases were 73 and 27%, respectively (tetragonal: 57%, cubic: 12%, and double-layer superlattice: 31%). High-resolution transmission electron microscopy confirmed that the fractions of the tetragonal and cubic coexisting phases were 76 and 24%, respectively, which existed in the forms of a single phase (tetragonal: 58%, cubic: 6%) and double-layer superlattice (36%).
Journal Title: Applied Physics Express
Year Published: 2018
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