Photoresponse of CsPbBr3 and Cs4PbBr6 Perovskite Single Crystals

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• 作者：Ji-Hyun Cha ; Jae Hoon Han ; Wenping Yin ; Cheolwoo Park ; Yongmin Park ; Tae Kyu AhnJeong Ho Cho ; Duk-Young Jung
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2017
• 出版时间：February 2, 2017
• 年：2017
• 卷：8
• 期：3
• 页码：565-570
• 全文大小：486K
• ISSN：1948-7185

文摘

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.