Fig. 2.
TA study of hydrothermal grown the Sb2S3 polycrystalline film. a 2D color plot of TA spectra of as-grown Sb2S3 polycrystalline film. b Principle spectral components and (c) associated kinetics from SVD analysis. Also shown in Fig. 2c is the mid-IR (5 μm) probe kinetics (gray-dashed line). d Maximum TA signal of B component (trapped carrier induced absorption) as a function of photoexcited carrier density and its linear fitting with R2 equal to 0.9996