Fig. 1: Substitution of Cs with Rb and K at A-site in alkali metals doped PeQW arrays. | Nature Communications

Fig. 1: Substitution of Cs with Rb and K at A-site in alkali metals doped PeQW arrays.

From: Ultrapure and efficient electroluminescence in alkali metal doped inorganic perovskite quantum wires arrays

Fig. 1: Substitution of Cs with Rb and K at A-site in alkali metals doped PeQW arrays.The alternative text for this image may have been generated using AI.

a Schematic illustration of the fabrication of alkali metals doped PeQW arrays and substitution of Cs with Rb and K at A-site in PeQW. Inset, cross-sectional TEM image of PeQW arrays. Scale bar, 200 nm. b Atomically resolved low-dose HRTEM image of single pristine CsPbBr3 QW with atomic structure model projected along <100> direction. Scale bar, 2 nm. Inset, fast Fourier transform diffractograms showing the cubic lattice structure. Scale bar, 2 nm−1. c, d Zoom-in low-dose HRTEM image of perovskite lattice in the edge and middle of pristine CsPbBr3 QW. Scale bar, 1 nm. e Rb 3 d and K 2p XPS core-level spectra of Rb+, K+: CsPbBr3 QWs. f XRD pattern of pristine CsPbBr3 QW, Rb+: CsPbBr3 QWs and Rb+, K+: CsPbBr3 QWs. g GIWAXS pattern and in-plane intensity profiles extracted from the GIWAXS of pristine CsPbBr3 QW, Rb+: CsPbBr3 QWs and Rb+, K+: CsPbBr3 QWs. h Atomically resolved low-dose HRTEM image of single pristine CsPbBr3 QW with atomic structure model projected along <110> direction. Scale bar, 2 nm. Inset, fast Fourier transform diffractograms showing the cubic lattice structure. Scale bar, 5 nm−1. i, j Zoom-in low-dose HRTEM image of perovskite lattice in the edge and middle of Rb+, K+: CsPbBr3 QWs. Scale bar, 1 nm.

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