Improved charge extraction in inverted perovskite solar cells with dual-site-binding ligands

Inverted (pin) perovskite solar cells (PSCs) afford improved operating stability in comparison to their nip counterparts but have lagged in power conversion efficiency (PCE). The energetic losses responsible for this PCE deficit in pin PSCs occur primarily at the interfaces between the perovskite and the charge-transport layers. Additive and surface treatments that use passivating ligands usually bind to a single active binding site: This dense packing of electrically resistive passivants perpendicular to the surface may limit the fill factor in pin PSCs. We identified ligands that bind two neighboring lead(II) ion (Pb 2+ ) defect sites in a planar ligand orientation on the perovskite. We fabricated pin PSCs…

• NS
  National Science Foundation

  Awards: DMR-1720139, 2025633, 1720139, ECCS-2025633
• UD
  U.S. Department of Energy

  Awards: DE-EE0010502, DE-EE0008753
• NU
  Northwestern University

  Awards: DMR-1720139, ECCS-2025633
• KA
  King Abdullah University of Science and Technology
• OO
  Office of Energy Efficiency and Renewable Energy

  Awards: DE-EE0010502, DE-EE0008753
• MR
  Materials Research Science and Engineering Center, Harvard University

  Awards: 1720139, DMR-1720139
• DO
  Division of Materials Research

  Awards: DMR-1720139, ECCS-2025633, 1720139
• DO
  Division of Electrical, Communications and Cyber Systems

  Awards: ECCS-2025633, 2025633
• OO
  Office of Energy Efficiency