Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 3, Pages 565-570Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.6b02763
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Funding
- Woo Jang Chun Special Project [PJ009106022013]
- Rural Development Association
- Center for Advanced Soft Electronics (CASE) under the Global Frontier Research Program [2013M3A6A5073177]
- National Research Foundation of Korea [2013M3A6A5073177] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Rural Development Administration (RDA), Republic of Korea [PJ009106032016, PJ009106022013] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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