Phase Stability and Diffusion in Lateral Heterostructures of Methyl Ammonium Lead Halide Perovskites,ACS Applied Materials & Interfaces

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Phase Stability and Diffusion in Lateral Heterostructures of Methyl Ammonium Lead Halide Perovskites
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-07-03 00:00:00 , DOI: 10.1021/acsami.9b06069
Rhiannon M Kennard , Clayton J Dahlman , Hidenori Nakayama ₁ , Ryan A DeCrescent , Jon A Schuller , Ram Seshadri ₂ , Kunal Mukherjee , Michael L Chabinyc

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Mixed halide hybrid organic–inorganic perovskites have band gaps that span the visible spectrum making them candidates for optoelectronic devices. Transport of the halide atoms in methyl ammonium lead iodide (MAPbI₃) and its alloys with bromine has been observed in both dark and under illumination. While halide transport upon application of electric fields has received much attention, less is known regarding bromide and iodide interdiffusion down concentration gradients. This work provides an upper bound on the bromide–iodide interdiffusion coefficient D_i in thin films of MAPb(Br_xI_1–x)₃ using a diffusion couples of lateral heterostructures. The upper bound of D_i was extracted from changes in the interface profiles of the heterostructures upon exposure to heat. The stability of thoroughly heated interfacial profiles suggests that the miscibility gap extends to higher temperatures and to a higher fractional composition of bromine than predicted by theory. The results of this work provide guidance for compositions of thermally stable heterostructures of hybrid halide perovskites.

中文翻译：

甲基铵卤化铅钙钛矿横向异质结构中的相稳定性和扩散

混合卤化物混合有机-无机钙钛矿具有跨越可见光谱的带隙，使其成为光电器件的候选者。已在黑暗和光照下观察到卤化物原子在甲基铵碘化铅 (MAPbI ₃ ) 及其与溴的合金中的迁移。虽然施加电场时的卤化物传输受到了很多关注，但关于溴化物和碘化物在浓度梯度下的相互扩散知之甚少。这项工作使用横向异质结构的扩散对提供了 MAPb(Br _x I _1-_x ) ₃薄膜中溴化物-碘化物相互扩散系数D _{i的上限。}D的上界_i是从暴露于热时异质结构的界面轮廓的变化中提取的。彻底加热的界面分布的稳定性表明，混溶性间隙延伸到更高的温度和比理论预测的更高的溴分数组成。这项工作的结果为杂化卤化物钙钛矿的热稳定异质结构的组成提供了指导。

更新日期：2019-07-03

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