Laser Processing of KBr‐Modified SnO<sub>2</sub> for Efficient Rigid and Flexible Ambient‐Processed Perovskite Solar Cells
Hongbo Mo, Qian Chen, Dong Wang, Dongxu Cheng, Suresh Maniyarasu, Muhamad Z. Mokhtar, Janet Jacobs, Tian Long See, Andrew G. Thomas, Richard J. Curry, Lin Li, Zhu Liu
Abstract
A combination of KBr modification and laser processing is utilized to prepare SnO 2 films for rigid and flexible perovskite solar cells (PSCs). The KBr modification effectively passivates the defects at the interface between SnO 2 and perovskite as well as grain boundaries of the perovskite film. A power conversion efficiency (PCE) of 20.14% is achieved with the KBr‐modified SnO 2 for the rigid PSCs fabricated under a relative humidity of around 65–75%, compared to the pristine SnO 2 films with a PCE of 18.66%. Then, a picosecond ultraviolet laser is employed to process KBr‐modified SnO 2 films on flexible substrates with a rapid scanning rate of 100 mm s −1 . The laser process improves the PCEs and durability of the PSCs. The flexible PSCs fabricated by the laser remain over 80% of their initial PCEs after 1000 bending cycles, higher than those fabricated by the hot plate showing 40% of their initial PCEs after the same bending cycles.