Enhancing Photovoltaically Preferred Orientation in Wide‐Bandgap Perovskite for Efficient All‐Perovskite Tandem Solar Cells

Abstract Wide‐bandgap perovskite solar cells (WBG PSCs) have promising applications in tandem devices yet suffer from low open‐circuit voltages ( V OC s) and less stability. To address these issues, the study introduces multifunctional nicotinamide derivatives into WBG PSCs, leveraging the regulation on photovoltaically preferential orientation and optoelectronic properties via diverse functional groups, e.g., carbonyl, amino. Isonicotinamide (IA) molecule emerges as the most effective agent, enhancing crystallization kinetics and defect passivation due to its unique planar spatial configuration. Incorporating IA into WBG perovskites improves the (100) preferred crystal orientation, reduces trap density, and…

• NN
  National Natural Science Foundation of China

  Awards: 62005188, 62120106001
• SU
  Sichuan University

  Award: 2020SCUNG102
• NK
  National Key Research and Development Program of China

  Award: 2022YFB4200901