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Schematic model and speculative digitized sequential intercalation process: (a, b) layered (with interlayer gap of 6.97 Å) parent PbI2, top layer is exposed to organic moiety (R-NH3I); (c, d) modification of top PbI2 layer into extended PbI42– network and intercalation of organic via interstitial spaces and exfoliation of Pb–I layer; and (e) second layer conversion into extended Pb42– network and the resultant (R-NH3)2PbI4 IO hybrid (interlayer separation44 of ∼18.32 Å for CHPI).
