Toward ultra-thin and omnidirectional perovskite solar cells: Concurrent improvement in conversion efficiency by employing light-trapping and recrystallizing treatment

Efficient perovskite solar cells with ultra-thin absorber would be very attractive for semitransparent-, tandem-, and flexible-photovoltaic application. However, the absorber with ultra-thin thickness always cause extra optical losses due to the insufficient light-harvesting. Here, we try to stress this key factor by constructing textured substrates and appropriate control of recrystallization treatment for ultra-thin perovskite solar cells that...