A team of researchers from China has developed a new strategy that tackles crystallographic defects and impurities that cause non-radiative recombination, a key limiting factor for large-area, flexible perovskite photovoltaics. The team demonstrated in situ defect detection and laser-based repair to improve film quality across large areas.
In the new approach, regions with high densities of crystallographic defects and impurities were identified and visually depicted through photoluminescence quantum yield and Urbach energy measurements. A 450 nm laser was then used to precisely and rapidly repair these defective regions, leading to a significant reduction in defect content compared with pristine perovskite films.
As a result, the researchers achieved a champion power conversion efficiency (PCE) of 25.21% (certified 24.57%) for 1.01 cm² flexible perovskite solar cells, and 17.36% for 100 cm² flexible solar modules, along with a high yield rate of 90%.
This work provides both technical and theoretical references for the commercialization of flexible perovskite photovoltaics.
