Metastable Dion-Jacobson 2D structure enables efficient and stable perovskite solar cells

The performance of three-dimensional (3D) organic-inorganic halide perovskite solar cells (PSCs) can be enhanced through surface treatment with 2D layered perovskites that have efficient charge transport. We maximized hole transport across the layers of a metastable Dion-Jacobson (DJ) 2D perovskite that tuned the orientational arrangements of asymmetric bulky organic molecules. The reduced energy barrier for hole transport increased out-of-plane transport rates by a factor of 4 to 5, and the power conversion efficiency (PCE) for the 2D PSC was 4.9%. With the metastable DJ 2D surface layer, the PCE of three common 3D PSCs was enhanced by approximately 12 to 16% and could reach approximately 24.7%. For a triple-cation-mixed-halide PSC, 90% of the initial PCE was retained after 1000 hours of 1-sun operation at similar to 40 degrees C in nitrogen.

Automated summary

The performance of 3D perovskite solar cells can be improved by treating the surface with 2D layered perovskites that have efficient charge transport. Adjusting the arrangement of organic molecules enhances hole transport and power conversion efficiency. The use of a stable 2D surface layer also improves the performance and stability of 3D perovskite solar cells.