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

So Min Park, Mingyang Wei, Jian Xu, Harindi R. Atapattu, Felix T. Eickemeyer, Kasra Darabi, Luke Grater, Yi Yang, Cheng Liu, Sam Teale, Bin Chen, Hao Chen, Tonghui Wang, Lewei Zeng, Aidan Maxwell, Zaiwei Wang, Keerthan R. Rao, Zhuoyun Cai, Shaik M. Zakeeruddin, Jonathan T. PhamChad M. Risko, Aram Amassian, Mercouri G. Kanatzidis, Kenneth R. Graham, Michael Grätzel, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


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 report a certified quasi-steady-state power-conversion efficiency of 24.09% for inverted-structure PSCs. In an encapsulated device operating at 85°C and 50% relative humidity, we document a 1560-hour T85 at maximum power point under 1-sun illumination.

Original languageEnglish
Pages (from-to)209-215
Number of pages7
Issue number6654
StatePublished - Jul 14 2023

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