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Cell refinement of CsPbBr3 perovskite nanoparticles and thin films

Abstract

In this work, we performed a detailed study of the phase transformations and structural unit cell parameters of CsPbBr3 nanoparticles (NPs) and thin films. In-situ X-ray diffraction patterns were acquired as a function of temperature, where the positions and widths of the diffraction peaks were systematically tracked upon heating and cooling down to room temperature (RT). Scanning electron microscopy provides physical insight on the CsPbBr3 thin films upon annealing and transmission electron microscopy gives physical and crystallographic information for the CsPbBr3 NPs using electron diffraction. The secondary phase(s) CsPb2Br5 (and CsPb4Br6) are clearly observed in the XRD patterns of both nanoparticles and thin films upon heating to 500K, where from 500K to 595K, these phases remain in small amount and are kept like this upon cooling down to RT. However, in the case of thin films, the CsPb2Br5 secondary phase disappears completely above 580K and pure cubic CsPbBr3 is observed up to 623K. The CsPbBr3 phase is then kept upon cooling down to RT achieving pure CsPbBr3 phase. This study provides detailed understanding of the phase behavior vs. temperature of CsPbBr3 NPs and thin films, which opens the way through pure CsPbBr3 phase, an interesting material for optoelectronic applications.

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Publication details

The article was received on 01 Aug 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8NA00122G
Citation: Nanoscale Adv., 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Cell refinement of CsPbBr3 perovskite nanoparticles and thin films

    C. Tenailleau, S. Aharon, B. E. Cohen and L. Etgar, Nanoscale Adv., 2019, Accepted Manuscript , DOI: 10.1039/C8NA00122G

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