Optimization of the aerosol-assisted solvent treatment on perovskite film on flexible substrate using strain engineering

Aerosol-Assisted Solvent Treatment (AAST) is an effective post-treatment method designed to improve the grain size of perovskite films, thereby reducing grain boundaries (GBs) and improving the performance of solar cells. During the application of AAST on perovskite films deposited on flexible substrates, a red shift in Photoluminescence (PL) was observed. Combined with X-Ray Diffraction (XRD) analysis, this phenomenon was attributed to the in-plane compressive stress within the grain boundary of perovskite. To address this issue, the process was adapted by simply bending the perovskite film during AAST, effectively reducing the aforementioned stress. This modification maintained the balance of strain engineering, offering a nuanced approach to optimizing the treatment process for flexible substrates.