Understanding and exploiting interfacial interactions between phosphonic acid functional groups and co-evaporated perovskites

Thomas Feeney, Julian Petry, Abderrezak Torche, Dirk Hauschild, Benjamin Hacene, Constantin Wansorra, Alexander Diercks, Michelle Ernst, Lothar Weinhardt, Clemens Heske, Ganna Gryn'ova*, Ulrich W. Paetzold*, Paul Fassl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Downloads (Pure)

Abstract

Interfacial engineering has fueled recent development of p-i-n perovskite solar cells (PSCs), with self-assembled monolayer-based hole-transport layers (SAM-HTLs) enabling almost lossless contacts for solution-processed PSCs, resulting in the highest achieved power conversion efficiency (PCE) to date. Substrate interfaces are particularly crucial for the growth and quality of co-evaporated PSCs. However, adoption of SAM-HTLs for co-evaporated perovskite absorbers is complicated by the underexplored interaction of such perovskites with phosphonic acid functional groups. In this work, we highlight how exposed phosphonic acid functional groups impact the initial phase and final bulk crystal structures of co-evaporated perovskites and their resultant PCE. The explored surface interaction is mediated by hydrogen bonding with interfacial iodine, leading to increased formamidinium iodide adsorption, persistent changes in perovskite structure, and stabilization of bulk α-FAPbI3, hypothesized as being due to kinetic trapping. Our results highlight the potential of exploiting substrates to increase control of co-evaporated perovskite growth.
Original languageEnglish
JournalMatter
Volume7
Early online date8 Mar 2024
DOIs
Publication statusE-pub ahead of print - 8 Mar 2024

Keywords

  • perovskite solar cell
  • self-assembled monolayer
  • hole-transport layer
  • interfacial engineering
  • co-evaporation
  • density functional theory
  • X-ray emission spectroscopy
  • nuclear magnetic resonance spectroscopy
  • vapor deposition
  • perovskite crystal growth

Fingerprint

Dive into the research topics of 'Understanding and exploiting interfacial interactions between phosphonic acid functional groups and co-evaporated perovskites'. Together they form a unique fingerprint.

Cite this