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Optical properties of CH3NH3PbX3 (X = halogen) and their mixed-halide crystals

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Abstract

Thin films of microcrystalline CH3NH3PbX3 (X = halogen) as well as their mixed-halide crystals were fabricated by the spin-coating technique, and their optical properties were investigated. X-ray diffraction investigation revealed that CH3NH3PbBr3 − x Cl x (x = 0–3) were successfully formed on glass substrate self-assembly and oriented with the a-axis. Owing to due to their large exciton binding energy, these materials showed clear exciton absorption and free-exciton emission in the visible region at room temperature. Replacing Br with CI made it possible to control the band structure of these materials. As a result, the peak position of the exciton band shifted continuously towards blue region with increasing the CI content in the films.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa, 239-8686, Japan

    N. Kitazawa, Y. Watanabe & Y. Nakamura

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  1. N. Kitazawa
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  2. Y. Watanabe
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  3. Y. Nakamura
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Kitazawa, N., Watanabe, Y. & Nakamura, Y. Optical properties of CH3NH3PbX3 (X = halogen) and their mixed-halide crystals. Journal of Materials Science 37, 3585–3587 (2002). https://doi.org/10.1023/A:1016584519829

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