Single-Crystal Growth and Thermal Stability of (CH<sub>3</sub>NH<sub>3</sub>)<sub>1–<i>x</i></sub>Cs<sub><i>x</i></sub>PbBr<sub>3</sub>
Hadar Kaslasi (8917940)Yishay Feldman (1687321)Yevgeny Rakita (3104244)David Cahen (1292538)Gary Hodes (1281663)
Abstract
We\ndescribe the growth of single crystals of the halide perovskites\nAPbBr<sub>3</sub>, with varying ratios of Cs to methylammonium (MA)\non the A site, by antisolvent vapor-assisted crystallization (AVC)\nand characterize the structural and compositional homogeneity of the\ngrown crystals. We find improved thermostability for the Cs-rich mixed\ncrystals and suggest that this is caused by a combination of locking-in\nof the relatively large MA in the smaller lattice of the Cs-rich material\nas well as by stronger hydrogen bonding between the nitrogen of MA\nand Br due to reduced lattice size and/or octahedral tilting with\nincreased Cs. We also show that it is possible to grow either compositionally\nhomogeneous crystals or core–shell, compositionally graded\ncrystals by changing the ratio of antisolvent to solvent in the AVC\nmethod.
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