Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 1, Pages 7-12Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b03381
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Funding
- NSFC [61674060]
- Fundamental Research Funds for the Central Universities, HUST [2017KFYXJJ030, 2017KFXKJC002, 2017KFXKJC003, 2018KFYXKJC016]
- New Mexico EPSCoR [NSF-1301346]
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Two-dimensional (2D) organic-inorganic perovskites have recently undergone rapid development because of their unique optical properties, layered nature, and better environmental stability. Here, we report on a new type of 2D lead-free perovskite (C6H5C2H4NH3)(2)CsSn2I7 crystals with millimeter size and high field-effect hole mobility synthesized by a solution method. The excellent crystalline quality and phase purity have been verified by X-ray diffraction and low-temperature photoluminescence studies, while the X-ray photoelectron spectroscopy and energy-dispersive spectrometry measurements reveal the successful incorporation of Cs element into the resultant crystals and the absence of Sn4+ in the as-synthesized crystals. The as-synthesized crystals exhibit a high electrical conductivity and a high hole mobility up to 34 cm(2).V-1.s(-1) at 77 K. The crystals also show a high photoresponse resulting from the excellent optical properties and high electrical conductivity. Our findings show that the lead-free (C6H5C2H4NH3)(2)CsSn2I7 crystals with excellent optoelectronic properties would be a promising material for electronic and optoelectronic applications.
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