Photoresponse of CsPbBr3 and Cs4PbBr6 Perovskite Single Crystals,The Journal of Physical Chemistry Letters

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Photoresponse of CsPbBr3 and Cs4PbBr6 Perovskite Single Crystals
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-01-13 00:00:00 , DOI: 10.1021/acs.jpclett.6b02763
Ji-Hyun Cha ₁ , Jae Hoon Han ₁ , Wenping Yin ₁ , Cheolwoo Park ₁ , Yongmin Park ₁ , Tae Kyu Ahn ₁ , Jeong Ho Cho ₁ , Duk-Young Jung ₁

Affiliation

High-quality and millimeter-sized perovskite single crystals of CsPbBr₃ and Cs₄PbBr₆ were prepared in organic solvents and studied for correlation between photocurrent generation and photoluminescence (PL) emission. The CsPbBr₃ crystals, which have a 3D perovskite structure, showed a highly sensitive photoresponse and poor PL signal. In contrast, Cs₄PbBr₆ crystals, which have a 0D perovskite structure, exhibited more than 1 order of magnitude higher PL intensity than CsPbBr₃, which generated an ultralow photoresponse under illumination. Their contrasting optoelectrical characteristics were attributed to different exciton binding energies, induced by coordination geometry of the [PbBr₆]^4– octahedron sublattices. This work correlated the local structures of lead in the primitive perovskite and its derivatives to PL spectra as well as photoconductivity.

中文翻译：

CsPbBr ₃和Cs ₄ PbBr ₆钙钛矿单晶的光响应

在有机溶剂中制备了高品质和毫米级的CsPbBr ₃和Cs ₄ PbBr ₆钙钛矿单晶，并研究了光电流产生与光致发光（PL）发射之间的相关性。具有3D钙钛矿结构的CsPbBr ₃晶体显示出高度敏感的光响应和较差的PL信号。相反，具有0D钙钛矿结构的Cs ₄ PbBr ₆晶体的PL强度比CsPbBr ₃高1个数量级。，在光照下产生超低的光响应。它们相反的光电特性归因于由[PbBr ₆ ] ^4–八面体亚晶格的配位几何结构引起的不同激子结合能。这项工作将原始钙钛矿中铅的局部结构及其衍生物与PL光谱以及光电导性相关联。

更新日期：2017-01-13

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