Photoresponse of CsPbBr3 and Cs4PbBr6 Perovskite Single Crystals

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 sensitiv...

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Published inThe journal of physical chemistry letters Vol. 8; no. 3; pp. 565 - 570
Main Authors Cha, Ji-Hyun, Han, Jae Hoon, Yin, Wenping, Park, Cheolwoo, Park, Yongmin, Ahn, Tae Kyu, Cho, Jeong Ho, Jung, Duk-Young
Format Journal Article
LanguageEnglish
Published American Chemical Society 02.02.2017
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Summary: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.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.6b02763