We found that the characteristic peaks of both Pb 4f 7/2 and Pb 4f 5/2 shift toward low E B with an increasing trend of TEA (138.13 and 143.01 eV) < PEA (138.24 and 143.11 eV) < MAPbI 3 (138.46 and 143.31 eV) as shown in Figure 4 c.
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Benefiting from Spontaneously Generated 2D/3D Bulk-Heterojunctions in Ruddlesden-Popper Perovskite by Incorporation of S-Bearing Spacer Cation.
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