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Lead free halide perovskite Cs3Bi2I9 bulk crystals grown by a low temperature solution method

Abstract

As one of the bismuth iodide family compounds, Cs3Bi2I9 perovskite shows potential applications in photovoltaic devices and radiation detectors, due to absence of toxic lead, high air and moisture stability. In this work, we report the Cs3Bi2I9 bulk crystals grown by a low temperature solvent volatilized crystallization method. The morphology of the single crystal exhibits a well symmetric hexagon shape, with layered structure along [00l] direction. Three defect related transitions (iodine substituting bismuth (IBi) to the valence band maximum (VBM), the conduction band minimum (CBM) to caesium substituting bismuth (CsBi1-/2-), and the CBM to caesium substituting iodine (CsI1+/2+)) are identified in 10 K photoluminescence spectra, with the dissociation energies of 47.87 meV, 45.28 meV, and 52.01 meV, respectively. The anisotropic resistivity along [00l] and [l00] directions are compared with the value of 11.08 GΩ·cm and 0.77 GΩ·cm, respectively, which is attributed to the difference of carrier mobility. This is further certified by the first principle calculations, which demonstrate the effective masses along [00l] and [l00] directions are 3.22me (electrons)/2.14me (holes) and 0.327me (electrons)/0.946me (holes), respectively. The Cs3Bi2I9 device exhibits fast photoresponse to optical light, with on-off ratio of ~24 along [l00], which is fifteen times higher than that of [00l]. This photoelectric anisotropy instructs the potential applications in photovoltaic devices and radiation detectors.

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Publication details

The article was received on 04 Jun 2018, accepted on 13 Jul 2018 and first published on 13 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00925B
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Lead free halide perovskite Cs3Bi2I9 bulk crystals grown by a low temperature solution method

    H. Zhang, Y. Xu, Q. Sun, J. Dong, Y. Lu, B. Zhang and W. Jie, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00925B

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