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Structural analysis of TA-PMA and HT2D: (a) chemical structure of TA-PMA including a hole-transporting unit and 2D-dimensional unit; (b) illustrative scheme: TA-PMA intercalation induced formation of HT2D perovskite capping layer on 3D perovskite; (c) 1HNMR spectra of TA-PMA and TA-PMA/PbI2. The inset is the molecule structure of TA-PMA; (d) XRD patterns of TA-PMA/PbI2, PMA/PbI2, and TA/PbI2.
