fig9

Figure 9. (A) Schematic diagram of the VATA technique for CsPbI₃-type perovskite films. This figure is quoted with permission from Ref.^[170], Copyright 2022 © Wiley-VCH; (B) A schematic diagram illustrating the evolution process of the crystal structure from the CsPbI₃-DMAAc precursor solution to γ-phase CsPbI₃, along with the possible chemical interactions and intermediate structures. This figure is quoted with permission from Ref.^[169], Copyright © 2022 Wiley-VCH; (C) Schematic diagram showing the formation of perovskite with and without melamine additive. This figure is quoted with permission from Ref.^[177], Copyright © 2020 Wiley-VCH; (D) Schematic diagram illustrating the mechanism by which the incorporation of CsTa enhances the stability of the PbI₂-prepared CsPbI_2.84Br_0.16. This figure is quoted with permission from Ref.^[179], Copyright © 2021 The Royal Society of Chemistry; (E) The stability mechanism of the cubic phase induced by PVP. Reprinted from Ref.^[33] under the CC BY 4.0 license. DMA⁺: Dimethylammonium; DMAAc: dimethylammonium acetate; DMF: N,N-dimethylformamide; DMAI: dimethylammonium iodide; DMSO: dimethyl sulfoxide; PVP: poly(vinyl pyrrolidone); VATA: vacuum-assisted thermal annealing.