Engineering ligand reactivity enables high-temperature operation of stable perovskite solar cells

Perovskite solar cells (PSCs) consisting of interfacial two- and three-dimensional heterostructures that incorporate ammonium ligand intercalation have enabled rapid progress toward the goal of uniting performance with stability. However, as the field continues to seek ever-higher durability, additional tools that avoid progressive ligand intercalation are needed to minimize degradation at high temperatures. We used ammonium ligands that are nonreactive with the bulk of perovskites and investigated a library that varies ligand molecular structure systematically. We found that fluorinated aniliniums offer interfacial passivation and simultaneously minimize reactivity with perovskites. Using this approach, we…

• NS
  National Science Foundation

  Awards: DMR-1720139, 2025633, 1720139, ECCS-2025633, ECCS-1936527
• UD
  U.S. Department of Energy

  Award: DE-SC0018208
• NU
  Northwestern University

  Awards: DMR-1720139, ECCS-2025633
• S
  Strong
• EC
  European Commission

  Award: 101026353
• OO
  Office of Science
• UN
  U.S. Navy

  Award: N00014-20
• MR
  Materials Research Science and Engineering Center, Harvard University

  Awards: 1720139, DMR-1720139
• OO
  Office of Naval Research

  Awards: N00014-20-1-2573, N00014-20-1-2572, N00014
• DO
  Division of Materials Research

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

  Awards: ECCS-2025633, 2025633
• BE
  Basic Energy Sciences

  Awards: DE-SC0018208, 1849213
• OO
  Office of Experimental Program to Stimulate Competitive Research

  Awards: SC0018208, 1849213