Fig. 3: Size-dependent PL-excitation spectra and excitation onset of CsPbBr3 nanowires. | Nature Communications

Fig. 3: Size-dependent PL-excitation spectra and excitation onset of CsPbBr3 nanowires.

From: Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires

Fig. 3

(a) An ensemble of surface-guided CsPbBr3 nanowires with different heights, with images showing a dark-field image and PL images with 514 and 458 nm excitation. (b) PLE spectra of structures with different heights. The colors of the lines correlate with the heights indicated by the same colors in the transmission image to the right of the plot. A blue-shift in emission excitation onset (sudden rise in PLE intensity upon decreasing the excitation wavelength) with decreasing height can be observed. (c) Normalized PL and PLE maps of a single tapered nanowire correlated with its height at each position. Both the peak emission wavelength (PL map) and emission onset wavelength (PLE map) show orchestrated blue-shifts with decreasing height of the nanowire.

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