Room‐Temperature Formation of Highly Crystalline Multication Perovskites for Efficient, Low‐Cost Solar Cells

Abstract
A room‐temperature perovskite material yielding a power conversion efficiency of 18.1% (stabilized at 17.7%) is demonstrated by judicious selection of cations. Both cesium and methylammonium are necessary for room‐temperature formamidinium‐based perovskite to obtain the photoactive crystalline perovskite phase and high‐quality crystals. This room‐temperature‐made perovskite material shows great potential for low‐cost, large‐scale manufacturing such as roll‐to‐roll processing.
Funding Information
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • Bundesamt für Energie
  • Horizon 2020 (687008)
  • King Abdulaziz City for Science and Technology