Fig. 1 | Communications Physics

Fig. 1

From: Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics

Fig. 1

Exciton-binding energy and Bohr radius. Schematic diagram of the a HOCH2CH2NH3+ (EA) molecule and b C6H5(CH2)2NH3+ (PEA) molecules. The large charge dipole caused by the O–H bond in EA is illuminated. c The exciton-binding energy and Bohr radius as a function of organic-group dielectric constant in 2D perovskites as predicted by the image charge model. Calculated exciton-binding energies and Bohr radii of PEA (square) and EA (diamond) based 2D perovskites are indicated. Inset (I): Lattice structures of (HOCH2CH2NH3)2PbI4 (2D_EA perovskites) and (II): (C6H5(CH2)2NH3)2PbI4 (2D_PEA perovskites)

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