Single-Crystal Growth and Thermal Stability of (CH3NH3)1–xCsxPbBr3,Crystal Growth & Design

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Single-Crystal Growth and Thermal Stability of (CH3NH3)1–xCsxPbBr3
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-05-12 , DOI: 10.1021/acs.cgd.0c00122
Hadar Kaslasi ₁ , Yishay Feldman ₂ , Yevgeny Rakita ₁ , David Cahen ₁ , Gary Hodes ₁

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We describe the growth of single crystals of the halide perovskites APbBr₃, with varying ratios of Cs to methylammonium (MA) on the A site, by antisolvent vapor-assisted crystallization (AVC) and characterize the structural and compositional homogeneity of the grown crystals. We find improved thermostability for the Cs-rich mixed crystals and suggest that this is caused by a combination of locking-in of the relatively large MA in the smaller lattice of the Cs-rich material as well as by stronger hydrogen bonding between the nitrogen of MA and Br due to reduced lattice size and/or octahedral tilting with increased Cs. We also show that it is possible to grow either compositionally homogeneous crystals or core–shell, compositionally graded crystals by changing the ratio of antisolvent to solvent in the AVC method.

中文翻译：

（CH ₃ NH ₃）_{1– x} Cs _x PbBr ₃的单晶生长和热稳定性

我们描述了卤化物钙钛矿APbBr ₃单晶的生长通过反溶剂气相辅助结晶（AVC）在A位点上以Cs与甲基铵（MA）的比率变化，并表征了生长晶体的结构和组成均匀性。我们发现富含Cs的混合晶体具有更高的热稳定性，并认为这是由于较大C的MA锁定在富含Cs的材料的较小晶格中，以及由氮之间的较强氢键结合造成的。 MA和Br是由于晶格尺寸减小和/或Cs增加而导致八面体倾斜。我们还表明，通过改变AVC方法中反溶剂与溶剂的比例，可以生长成分均一的晶体或核-壳，成分渐变的晶体。

更新日期：2020-07-01

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