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Solution-processed mixed halide CH3NH3PbI3−xClx thin films prepared by repeated dip coating

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Abstract

The mixed halide CH3NH3PbI3−xClx crystalline thin film has been prepared by two-step solution-processed repeated dip coating method at an ambient atmosphere. X-ray diffraction study reveals the presence of tetragonal and cubic phases in deposited film. Raman study confirms the metal halide bond in the inorganic framework and organic CH3 stretching/bending of C–H bond in CH3NH3PbI3−xClx perovskite. Scanning electron microscopy shows that cuboid and polyhedral-like crystal grains of 100 nm to 2 μm may find applications in optoelectronics. The perovskite CH3NH3PbI3−xClx thin film shows high spectral absorption coefficient of the order of 106 m−1. In optical band gap study, we found the coexistence of cubic and tetragonal perovskite phases. The energy band gap is dominated by cubic phase having Eg = 2.50 eV over tetragonal phase with band gap Eg = 1.67 eV. The room-temperature photoluminescence study confirms band edge, shallow and deep-level emissions. The temperature-dependent cathodoluminescence study shows red, green and ultraviolet emissions. The dominating green luminescence evolved for cubic phase at 2.51 eV. The red and ultraviolet emissions are also found for mixed-phase CH3NH3PbI3−xClx thin film, suitable for preparation of light-emitting devices.

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Acknowledgements

Authors are thankful to the department of Glass and Ceramic Engineering, Rajshahi University of Engineering & Technology, Bangladesh, for providing XRD and SEM facilities. The authors are also grateful to the Department of Materials Science and Engineering, City University of Hong Kong, for providing Raman spectroscopy measurement. One of the authors M. Azizar Rahman acknowledges the financial support of Australian Government through the Research Training Program Scholarship.

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Correspondence to M. K. R. Khan.

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Karim, A.M.M.T., Hossain, M.S., Khan, M.K.R. et al. Solution-processed mixed halide CH3NH3PbI3−xClx thin films prepared by repeated dip coating. J Mater Sci 54, 11818–11826 (2019). https://doi.org/10.1007/s10853-019-03740-0

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