Fig. 3: Analyses of carrier dynamics. | Nature Communications

Fig. 3: Analyses of carrier dynamics.

From: Nanoscale soft interaction-engineered perovskite heterojunctions for highly efficient and reproducible solar cells

Fig. 3: Analyses of carrier dynamics.

a–c PL mapping of the pristine CsFAMA perovskite (a), the 3F-PEA/CsFAMA heterojunction (b), and the DMS-modulated 3F-PEA/CsFAMA heterojunction films (c) at ~560 nm, corresponding to the n = 2 layer, along with their schematic illustration. Scale bar: 5 μm. Ellipsis represents the continuity of the 3D structure. d–f PL mapping images of the films at ~810 nm (corresponding to CsFAMA perovskite). Scale bar: 500 μm. The panels below show the normalized PL intensity distribution corresponding to the labeled areas in the images above. Nor. is Normalized. g TRPL spectra of the pristine CsFAMA perovskite film, the 3F-PEA/CsFAMA heterojunction film, and the DMS-modulated 3F-PEA/CsFAMA heterojunction film. The incident laser is from the perovskite surface, and the laser fluence was ~30 nJ/cm2. h UPS spectra of the pristine CsFAMA perovskite film, the 3F-PEA/CsFAMA heterojunction film, and the DMS-modulated 3F-PEA/CsFAMA heterojunction film. i Schematic energy level diagram of the heterojunction/C60 interface. The solid and dashed lines represent the energy levels before and after DMS modulation, respectively. LD low-dimensional perovskite layer, CBM Conduction Band Minimum, VBM Valence Band Maximum, EF Fermi level.

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