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. 2021 Mar 16;12:1686. doi: 10.1038/s41467-021-21934-6

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© The Author(s) 2021

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Fig. 2 — a FTIR spectra of the powders of MAI, PbI₂, and MAPbI₃ with 10 mol% DPSI. b Scheme of DPSI absorption difference on different crystal facets which have different Pb²⁺ density. c Scheme of crystal growth mechanism at the surface of crystal where the DPSI molecules modulate the diffusion of metal ions to reach the perovskite surface.