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Growth of mixed-halide perovskite single crystals

Abstract

In this paper, systematic halogen doping CH3NH3PbI3-xBrx and CH3NH3PbBr3-yCly bulk single crystals were grown with mixed organic solvents via the ITC (Inverse temperature crystallization) method. The result of X-ray diffraction measurement shows the lattice constants of CH3NH3PbI3-xBrx and CH3NH3PbBr3-yCly crystals change linearly with x(y) values. For CH3NH3PbI3-xBrx crystals, cubic to tetragonal phase transformation was observed where the iodine content reaches to a certain level. The comparison of UV-vis-NIR absorption and PL spectra of CH3NH3PbI3-xBrx and CH3NH3PbBr3-yCly crystals shows their absorption coefficients are contributed by direct and indirect bandgap transitions. Three kinds of mechanism were involved in their radiative recombination, including direct emission, indirect emission and direct-indirect coexisting emission. CH3NH3PbI3-xBrx (x=1.64, 2.39, 2.81, 2.9) crystals were considered to be indirect band gap materials, since their band edges can be divided into two sections by a turning point. TG analysis shows the beginning decomposing temperature of CH3NH3PbI3-xBrx and CH3NH3PbBr3-yCly crystals decreases with the increasing x(y) values. Researches on CH3NH3PbI3-xBrx and CH3NH3PbBr3-yCly single crystals would be helpful to reveal the inherent properties of perovskite materials.

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Publication details

The article was received on 22 Sep 2017, accepted on 13 Feb 2018 and first published on 13 Feb 2018


Article type: Communication
DOI: 10.1039/C7CE01691C
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Growth of mixed-halide perovskite single crystals

    W. F. wang, J. Su, L. Zhang, Y. Lei, D. Wang, D. Lu and Y. Bai, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE01691C

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