Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. 2D pero-MQW structural and optical properties and direction observations of the layer edge current.
  • Fig. S2. Layer edge current development along the contour direction.
  • Fig. S3. Layer edge charge distribution along the contour direction.
  • Fig. S4. Scan rate effects on layer edge current.
  • Fig. S5. Layer edge current polarity study.
  • Fig. S6. Repeatability of the layer edge current.
  • Fig. S7. SEM and confocal Raman mapping study of layer ES.
  • Fig. S8. Optical image of pero-MQWs.
  • Fig. S9. Hertz method analysis on the tip contact with samples.
  • Fig. S10. Possible mechanisms for the current polarity conversion at the layer edges.
  • Note S1. Estimation of ECIR and charge carrier density.
  • Note S2. Conjecture of the current polarity conversion at the layer edges.
  • Note S3. Sample bias influence on layer edge currents.
  • Note S4. Large exciton binding energy in 2D pero-MQWs.
  • Note S5. Surface charge effect exclusion study by SEM and confocal Raman mapping measurements.
  • Appendix S1. The c-AFM edge current on samples of (C4H9NH3)2(CH3NH3)n−1PbnI3n+1 (n = 2, 3, 4, and ∞).

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