Figure 6
Femtosecond transient absorbance spectra with λexc = 580 nm and WLC probe of a) (CH3NH3)PbI3/Al2O3, b) (CH3NH3)PbI3/TiO2, c) Spiro/(CH3NH3)PbI3/Al2O3, and d) Spiro/(CH3NH3)PbI3/TiO2, recorded at various time delays after excitation (color lines).
Black dashed lines represent the absorbance spectrum of the sample (scaled by a factor –0.01). The wavelengths region around laser excitation (555 – 630 nm) is not shown.
