Defect Passivation with Organic Co‐Crystal Layers for Efficient and Stable Inverted Perovskite Solar Cells: A Non‐2D‐Perovskites Strategy for Surface Treatments

ABSTRACT Surface defects caused by the wet‐chemical deposition method negatively affect the performance and stability of inverted perovskite solar cells (PSCs). It is common to post treat perovskite films with large‐sized organic ammonium salts, which allow for the formation of 2D perovskites on top of the perovskite films. However, the low‐dimensional perovskites feature a low charge carrier mobility and poor structural stability. To address these issues, we introduce an organic co‐crystal layer rather than 2D perovskites on top of the perovskite film in this work. This co‐crystal layer effectively passivates the surface defects through a reinforced hydrogen‐bonding network, suppresses non‐radiative…

• FR
  Fundamental Research Funds for the Central Universities