Three- and two-dimensional mixed metal halide perovskites for high-performance photovoltaics

Three-dimensional (3D) metal halide perovskites (MHPs) incorporated with two-dimensional (2D) MHPs have been demonstrated to be a facile way to approach the high performance of perovskite photovoltaics (PPVs). In this study, we report high-performance PPVs, in terms of efficiency, detectivity, stability, and photocurrent hysteresis, based on the 3D mixed with 2D MHPs composites (termed as the 2D:3D mixed MHPs composites), where 4-fluoro-phenethylammonium, which possesses larger dipole moment compared to phenethylammonium, is used to create 2D MHPs. Systematically studies indicate that the 2D:3D mixed MHPs composites possess larger crystals, higher crystallinity, and enhanced charge transport compared to 3D MHPs thin film. As a result, the PPVs based on the 2D:3D mixed MHPs composites exhibit over 21.16 +/- 0.53% power conversion efficiency with suppressed photocurrent hysteresis, over 1016 cm Hz1/2W-1 detectivity, and dramatically boosted stability. Our results indicate that we provide a facile way to approach high-performance PPVs.

Automated summary

This study reports high-performance perovskite photovoltaics (PPVs) based on 3D mixed with 2D metal halide perovskites (MHPs) composites. The composites exhibit larger crystals, higher crystallinity, and enhanced charge transport compared to 3D MHPs thin film, resulting in over 21.16 +/- 0.53% power conversion efficiency, suppressed photocurrent hysteresis, and boosted stability.