Science Advances

Supplementary Materials

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  • fig. S1. Comparative analysis of crystal structures of PbI2·xHI and HPbI3.
  • fig. S2. Morphology of EDAPbI4 films.
  • fig. S3. Schematic structure of (110) layered 2D films.
  • fig. S4. The organic compositions of CsPbI3·xEDAPbI4 films.
  • fig. S5. Characterization of CsPbI3 + 0.05PbI2 with or without EDAI2.
  • fig. S6. Effect of EDAPbI4 on the optical properties.
  • fig. S7. Effect of EDAPbI4 on the transient photovoltage behavior.
  • fig. S8. Hysteresis behavior of CsPbI3·0.025EDAPbI4-based device.
  • fig. S9. Effect of EDAPbI4 on the phase stability of CsPbI3·xEDAPbI4 perovskite films.
  • fig. S10. Phase stability of CsPbI3·0.025EDAPbI4 perovskite film under room temperature.
  • fig. S11. Phase stability of CsPbI3·0.025EA2PbI4-based films.
  • fig. S12. Device performance of CsPbI3·0.025EA2PbI4-based solar cell.
  • fig. S13. Phase stability of CsPbI3·0.025BA2PbI4-based films.
  • fig. S14. Effect of CsPbI3·0.025BDAPbI4 and CsPbI3·0.025EDBEPbI4 2D perovskite component on the evolution of morphology.
  • fig. S15. Phase stability of CsPbI3·0.025BDAPbI4 and CsPbI3·0.025EDBEPbI4 films.

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