Growth and Characterization of PDMS-Stamped Halide Perovskite Single Microcrystals
Growth and Characterization of PDMS-Stamped Halide Perovskite Single Microcrystals
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DOI：
10.1021/acs.jpcc.6b02011
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发表时间：
2016-03-31
影响因子：
3.7
通讯作者：
Garnett, Erik C.
中科院分区：
文献类型：
--
作者：
Khoram, Parisa;Brittman, Sarah;Garnett, Erik C.
最近，卤化物钙钛矿在光电应用中引起了相当大的关注，但是在该领域的进一步进展需要对这些材料的基本性质的透彻理解。研究单晶形式的钙钛矿为建立这样的理解提供了一个模型系统。本文采用一种简单的溶液处理方法结合PDMS（聚二甲基硅氧烷）模压法制备了薄的卤化物钙钛矿单晶。该方法适用于广泛的材料，包括CH3NH3PbBr3、CH3NH3PbCl3、CH3NH3Pb（Br0.5Cl0.5）（3）、CH3NH3Pb（Br0.75Cl0.25）（3）、CsPbBr3、Cs3Bi2Br9和Cs3Bi2I9。电子背散射衍射（EBSD）被用来研究晶体的微观结构。为了表征CH3NH3PbBr 3的微晶的电学特性，在预制的电极上生长晶体，从而产生从背面接触的单晶器件。这种背接触平台避免了卤化物钙钛矿与标准微制造工艺中使用的水性化学品之间的不相容性。它还允许钙钛矿晶体的原位表征，同时它作为微观太阳能电池运行。
Recently, halide perovskites have attracted considerable attention for optoelectronic applications, but further progress in this field requires a thorough understanding of the fundamental properties of these materials. Studying perovskites in their single-crystalline form provides a model system for building such an understanding. In this work, a simple solution-processed method combined with PDMS (polydimethylsiloxane) stamping was used to prepare thin single microcrystals of halide perovskites. The method is general for a broad array of materials including CH3NH3PbBr3, CH3NH3PbCl3, CH3NH3Pb(Br0.5Cl0.5)(3), CH3NH3Pb(Br0.75Cl0.25)(3), CsPbBr3, Cs3Bi2Br9, and Cs3Bi2I9. Electron backscatter diffraction (EBSD) was used to investigate the microstructure of the crystals. In order to characterize the microcrystals of CH3NH3PbBr3 electrically, the crystals were grown on prefabricated electrodes creating single-crystal devices contacted from the back. This back-contacted platform circumvents the incompatibility between halide perovskites and the aqueous chemistry used in standard microfabriation processes. It also allows in situ characterization of the perovskite crystal while it operates as a microscopic solar cell.