Science Advances

Supplementary Materials

The PDF file includes:

  • Section S1. Calibration of pressure using emission line of ruby sphere
  • Section S2. Crystal quality and layer orientation of (PEA)2PbI4 flake
  • Section S3. Band structure and bandgap evolution under pressure
  • Section S4. Analyses of the quantum confinement effects under pressure
  • Section S5. The reversibility of (PEA)2PbI4 under pressure revealed by Raman spectra
  • Section S6. The fitting of the trPL spectra under different pressures
  • Section S7. The enhancement of exciton radiative recombination
  • Section S8. The lattice angles of (PEA)2PbI4 under different pressures
  • Section S9. The quantitative analyses of the PbI64− octahedral distortion and rotation
  • Fig. S1. The selected PL spectra of ruby sphere under different pressures.
  • Fig. S2. SEM images on the section view of a typical as-grown crystal of (PEA)2PbI4.
  • Fig. S3. The first-principles calculation of band structure and bandgap evolution.
  • Fig. S4. Pressure dependence of effective mass of electron and hole in (PEA)2PbI4.
  • Fig. S5. The optical micrographs of the (PEA)2PbI4 crystal inside DAC under different pressures.
  • Fig. S6. The low–wave number Raman spectra and peak shift of (PEA)2PbI4 under different pressures.
  • Fig. S7. The temperature-dependent PL spectra of (PEA)2PbI4.
  • Fig. S8. The biexponential fitting of the trPL spectra of (PEA)2PbI4 under different pressures.
  • Fig. S9. The lattice angles of (PEA)2PbI4 under different pressures.
  • Fig. S10. The octahedral distortion and rotation evaluated by synchrotron radiation XRD and first-principles calculation.
  • Table S1. The fitting parameters of trPL and calculated average PL lifetime.

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Other Supplementary Material for this manuscript includes the following:

  • Movie S1 (.mp4 format). A video displaying the lattice structure evolution under pressure.

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