Science Advances

Supplementary Materials

This PDF file includes:

  • Supplementary Text
  • fig. S1. Overlay of simulated electron scattering pattern and the measured diffraction pattern.
  • fig. S2. Transient absorption data and analysis for MAPbI3.
  • fig. S3. Long-time dynamics for high-order Bragg peaks of perovskite thin films for two photoexcited carrier densities.
  • fig. S4. Scanning electron microscopy images of thermally evaporated perovskite thin films on TEM grids, showing an averaged grain size of about 50 to 100 nm.
  • fig. S5. Pump fluence dependence of Bragg peak 1 to 4 (markers) intensity decay and single exponential fits (gray lines) to peaks 3 and 4.
  • fig. S6. Pump fluence dependence of Bragg peak 5 to 8 (markers) intensity decay and single exponential fits (gray lines) to each peak.
  • fig. S7. Global fitting of time-dependent intensity for peaks not shown in Fig. 2.
  • fig. S8. Gaussian fit peak center change as function of pump-probe time delay for two photoexcited carrier densities.
  • fig. S9. Calculated PDF difference between MD simulation temperatures T = 400 K and T = 375 K.
  • fig. S10. Differential PDF plots of gold polycrystalline thin film at different time delays.
  • fig. S11. Differential PDF plots at long-time delays under excitation at 400 nm with a carrier density of 2.3 × 1019/cm3.
  • fig. S12. Differential PDF plots at different time delays under excitation at 400 nm with a carrier density of 4.5 × 1019/cm3.
  • fig. S13. Differential PDF plots at different time delays under excitation at 400 nm with a carrier density of 2.3 × 1019/cm3.
  • fig. S14. Differential PDF plots at different time delays under excitation at 400 nm with a carrier density of 1.4 × 1019/cm3.
  • fig. S15. Comparison between electron diffraction on MAPbI3 and PbI2 thin films.
  • fig. S16. Absorption spectra of MAPbI3 and PbI2; PbI2 time-resolved diffraction response.
  • fig. S17. Differential PDF plots of PbI2 thin films at different time delays.
  • fig. S18. Temperature-dependent x-ray diffraction scans across the tetragonalcubic phase transition in MAPbI3 (measured from crystalline powders).
  • fig. S19. Zoom-in evolution of diffraction peaks across the tetragonal-cubic phase transition.
  • fig. S20. Intensity of (211) reflection as a function of temperature showing gradual decrease in intensity during the tetragonal-cubic transition.
  • fig. S21. Normalized changes in area for selected diffraction peaks shown in fig. S18 as a function of temperature.
  • table S1. Index of diffraction peaks.
  • table S2. Summary of carrier density, ΔT, mean square displacement, and Debye temperature.
  • table S3. Summary of decay time constants in picoseconds from single exponential fits of individual peaks under different pump fluences.
  • table S4. Gaussian fit peak centers for eight peaks.
  • table S5. Calculated atomic RMS in angstroms at different temperatures.
  • References (52–56)

Download PDF

Files in this Data Supplement: