Fengke Sun, Boning Wu, Shengye Jin. Large bandgap oscillations in two-dimensional Dion–Jacobson phase perovskites caused by coherent longitudinal acoustic phonons [Invited][J]. Chinese Optics Letters, 2022, 20(10): 100010
- Chinese Optics Letters
- Vol. 20, Issue 10, 100010 (2022)
Fig. 1. Cross-sectional SEM images of the (DMAPA)PbI4 films.
Fig. 2. (a) Scheme of TA experiments; (b) 2D contour plot of TA spectra; (c) ΔA spectra at selected time delays; (d) dependence of oscillation period and amplitude on film thickness; (e) dependence of oscillation period and amplitude on pump photon energy; (f) elucidating the origin of TA bandgap oscillation.
Fig. 3. (a) Scheme of front-face TR experiments; (b) 2D contour plot of TR spectra; (c) time-dependent ΔR/R at selected wavelengths; (d) dependence of oscillation period on wavelength of probe light; (e) elucidating the origin of oscillation observed in TR experiments.
Fig. 4. (a) Scheme of BTR experiments; (b) 2D contour plot of BTR spectra; (c) time-dependent ΔR/R at selected wavelengths; (d) time when the CLAP arrives at air–perovskite interfaces for films of different thicknesses; (e) elucidating the origin of oscillation, and the CLAP arrival time observed in BTR experiments.
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