vapor 77 slot situstoto Hwang et al. introduced a solvent vapor soaking technique to form a porous PbI 2 film. Iwan et al. applied vacuum treatment to control the porosity and stability of the PbI 2 intermediate layer. For triple-cation perovskites, the addition of Cs + cation to the PbI 2 precursor solution helps remedy insolubility issues during the second step
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