Film Formation Control for High Performance Dion-Jacobson 2D Perovskite Solar Cells

Dion-Jacobson (DJ) 2D hybrid perovskite semiconductors offer improved environmental stability and higher structural diversity in comparison with their 3D analogous. However, lacking of controlled perovskite crystallization makes it a challenge to achieve high charge transport for photovoltaic devices. Here, a detailed understanding of effects on film formation during different solution-casting processes for the DJ perovskite (PDMA)(MA)(n)-1PbnI3n+1 ( = 4, PDMA refers to 1,4-phenylenedimethanammonium) in the final film structure and photovoltaic outcomes is presented. Faster removal of solvent from solution via hot-casting or antisolvent dripping results in a more uniform thickness distribution of quantum wells. This eventually enhances carrier transport greatly along perpendicular direction and increases power conversion efficiencies. A high efficiency of 15.81% is achieved for the hot-casting devices, which is also the highest for aromatic spacer-based DJ perovskite solar cells. This work helps to better understand the control of film formation during solution-casting for high performance solar cells.

Automated summary

In this study, a detailed investigation into the effects of different solution-casting processes on film formation for DJ perovskite semiconductors was conducted. It was found that faster solvent removal through hot-casting or antisolvent dripping resulted in a more uniform thickness distribution of quantum wells, leading to enhanced carrier transport and increased power conversion efficiencies for photovoltaic devices. High efficiency of 15.81% was achieved for hot-casting devices, marking it as the highest efficiency for aromatic spacer-based DJ perovskite solar cells.