Science Advances

Supplementary Materials

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  • fig. S1. Structural characterization of perovskite films.
  • fig. S2. Scanning electron microscopy analysis of perovskite films.
  • fig. S3. Streak camera image of the time-resolved PL measurements recorded from the CH3NH3PbI3 film sample at 15 and 300 K.
  • fig. S4. Streak camera image of the time-resolved PL measurements recorded from the CH3NH3PbBr3 film sample at 15 and 300 K.
  • fig. S5. Streak camera image of the time-resolved PL measurements recorded from the CH(NH2)2PbBr3 film sample at 15 and 300 K.
  • fig. S6. Time-resolved PL of CH3NH3PbI3 as a function of temperature (fluence = 2 μJ/cm2).
  • fig. S7. Time-resolved PL of CH3NH3PbBr3 as a function of temperature (fluence = 3 μJ/cm2).
  • fig. S8. Time-resolved PL of CH(NH2)2PbBr3 as a function of temperature (fluence = 3 μJ/cm2).
  • fig. S9. Structure of the ideal orthorhombic phase.
  • fig. S10. Pb-I pair correlation function of the MA-ordered and MA-disordered domains of the orthorhombic system and of the tetragonal phase.
  • fig. S11. VBM of the MA-ordered and MA-disordered orthorhombic systems and of the tetragonal system.
  • fig. S12. Band structure of the ordered and random domains of the orthorhombic phase of CH3NH3PbI3.
  • fig. S13. Scheme illustrating possible absorption, relaxation, and emission mechanisms at low temperature in CH3NH3PbI3 and CH3NH3PbBr3.
  • fig. S14. Configurations of the samples used in the first-principles electronic structure calculations.

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