Enabling room-temperature processed highly efficient and stable 2D Ruddlesden-Popper perovskite solar cells with eliminated hysteresis by synergistic exploitation of additives and solvents

摘要: Herein we demonstrate the favorable synergistic effect of an NH4Cl additive and DMSO solvent on 2D perovskites that are synthesized at room temperature. Interestingly, observe spontaneous formation 3D phases within either or treated perovskites, which plays a pivotal role in facilitating charge transport. It is revealed increases carrier lifetime passivate trap states phase while promotes 2D/3D inter-phase transfer. These two competitive processes reach delicate balance co-treated devices, deliver maximum PCE up to 13.41% with excellent air-stability eliminated hysteresis. This among highest values reported for RP perovskite (n = 4) based planar solar cells, particularly via all low-temperature solution fabrication.