Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. UV-vis absorption spectrum of 3D and 3D/2D perovskite films and geometry of FEA+ cation.
  • Fig. S2. Surface and in-depth elemental analyses of 3D/2D perovskite bilayer.
  • Fig. S3. Cross-comparison of the GIWAXS patterns on surface and in bulk for 3D and 3D/2D perovskites, respectively.
  • Fig. S4. Steady-state PL of 3D and 3D/2D perovskite systems.
  • Fig. S5. Hole injection dynamics and band diagram of the 3D/2D perovskite system.
  • Fig. S6. JSC, VOC, FF, and PCE distributions of 50 devices, in which 25 devices are 3D/2D PSCs and 25 are 3D PSCs.
  • Fig. S7. Impedance spectroscopy and capacitance measurement of 3D and 3D/2D PSCs.
  • Fig. S8. Water and humidity resistance of 3D/2D and 3D PSCs.
  • Fig. S9. Image of water droplet on the surface of pure 2D (FEAI)2PbI4 perovskite films.
  • Fig. S10. Stability of a 3D/2D PSC and a 3D PSC at an elevated temperature.

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