Unraveling All‐Inorganic CsPbI 3 and CsPbI 2 Br Perovskite Thin Films Formation – Black Phase Stabilization by Cs 2 PbCl 2 I 2 Addition and Flash‐Annealing
Abstract
Phase formation and transformation of 3D inorganic halide perovskites CsPbI3 and CsPbI2Br were investigated by in-situ X-ray diffraction (XRD) in nitrogen or air from 30 °C up to 320 °C. Thin films were obtained by spin-coating of a liquid solution of salt precursors dissolved in DMSO under normal conditions. XRD data analysis, by using the Le Bail method, evidenced for the first time, to our knowledge, the spontaneous crystallization of black orthorhombic γ phase at ambient temperature, for both 3D perovskite phases. For once, this black γ phase could be studied upon heating. It transforms to the black tetragonal β and cubic α phases. The reverse transitions were also evidenced upon cooling. The influence of the all-inorganic 2D Cs2PbI2Cl2 material addition over the black phase stability was unprecedently analyzed by in-situ XRD. The mixture of the 3D and 2D phases, or mix [3D+2D], exhibits an improved stability of the black phase compared to the single 3D phase, and tends to induce highly oriented thin films and increased compactness, probably due to chemical insertion or anchoring. Finally, flash-annealed thin films at various temperatures (RT
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Submitted on : Monday, November 14, 2022-2:26:58 PM
Last modification on : Monday, March 27, 2023-9:34:24 AM
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Edouard Breniaux, Pascal Dufour, Sophie Guillemet-Fritsch, Christophe Tenailleau. Unraveling All‐Inorganic CsPbI 3 and CsPbI 2 Br Perovskite Thin Films Formation – Black Phase Stabilization by Cs 2 PbCl 2 I 2 Addition and Flash‐Annealing. European Journal of Inorganic Chemistry, 2021, 2021 (30), pp.3059-3073. ⟨10.1002/ejic.202100304⟩. ⟨hal-03851384⟩
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