Perovskite nanowires as defect passivators and charge transport networks for efficient and stable perovskite solar cells

Abstract

The problems posed by the presence of ionic defects on the surface and at the grain boundaries of perovskite films must be solved before the power conversion efficiency of organic–inorganic halide perovskite solar cells can be enhanced. While a number of strategies to address this problem have been developed, the challenge of achieving both effective passivation and charge transporting performance remains. In this paper, inorganic perovskite nanomaterials, shaped into nanowires (NWs), were introduced as a strategy to passivate defects at the grain boundaries and facilitate charge transport across the interfacial charge transport layer. The NW-modified perovskite film significantly reduced defect sites and extended carrier lifetime compared to quantum dot-modified and pristine perovskite films, reducing non-radiative recombination significantly. The perovskite solar cells passivated with NWs achieved a power conversion efficiency of 21.56% and improved device stability over a 3500-hour period.