Controlled Growth of Porous InBr₃: PbBr₂ Film for Preparation of CsPbBr₃ in Carbon-Based Planar Perovskite Solar Cells.

As the PbBr 2 concentration increased from 1.0 to 1.3 M, J SC , V OC , FF, and PCE all showed a trend of increasing with the increase in PbBr 2 concentration.

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Based on the cross-sectional SEM images of the corresponding PbBr 2 films ( Figure S1, Supplementary Materials ), it can be concluded that the thickness of the film (330, 400, 450, 500, and 550 nm), the grain size, and the gap between the crystal grains (clusters) all exhibit an increasing trend with the increase in the PbBr 2 concentration, which provides the pivotal condition to enhance the diffusion rate of the CsBr precursor and increase the contact area and reaction efficiency between CsBr and PbBr 2 , and subsequently guarantee the production of high-quality CsPbBr 3 films with high thickness, high purity, high density, and large crystal grains.

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