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. 2018 Aug 30;9:3531. doi: 10.1038/s41467-018-06009-3

Fig. 3.

Fig. 3

Spectrally resolved picosecond transient absorption spectra. a CH3NH3PbI3 hybrid perovskite bulk film (excitation approximately 1.72 eV, 15 µJ cm−2) and b CsPbI3 nanocrystal film (excitation approximately 1.90 eV, 4 µJ cm−2). The samples were excited with laser pulses of FWHM approximately 25 meV and pulse length of approximately 50 fs. The change in transmission of the probe was measured at the indicated time delays with the linear polarization of the probe pulse aligned parallel (red) or perpendicular (blue) to the linear polarization of the pump pulse. The initially polarization-dependent spectra converge within the first 10 ps after photoexcitation