Fig. 1: OPTP measurement scheme and sample characterizations. | Light: Science & Applications

Fig. 1: OPTP measurement scheme and sample characterizations.

From: Photoinduced large polaron transport and dynamics in organic–inorganic hybrid lead halide perovskite with terahertz probes

Fig. 1

a, b Schematic illustration of the OPTP spectroscopy on MAPbI3. The quickly-oscillating pulse (red) is the optical pump beam, and the time-delayed single-cycle pulse (blue) represents the THz probe beam. c THz and FTIR absorbance spectra from 0.4 to 1.6 THz. d DFT calculated I-Pb-I bending motions at 24.8 and 49.1 cm−1 of MAPbI3. The gray and purple balls denote Pb and I atoms, respectively. e Time-domain signals transmitted through the MAPbI3 polycrystalline grains covered on a double-sided tape for different pump fluences (800 nm excitation). f A transmitted THz waveform through the sample without photoexcitation

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