Highly Reproducible Sn‐Based Hybrid Perovskite Solar Cells with 9% Efficiency

Abstract The low power conversion efficiency (PCE) of tin‐based hybrid perovskite solar cells (HPSCs) is mainly attributed to the high background carrier density due to a high density of intrinsic defects such as Sn vacancies and oxidized species (Sn 4+ ) that characterize Sn‐based HPSCs. Herein, this study reports on the successful reduction of the background carrier density by more than one order of magnitude by depositing near‐single‐crystalline formamidinium tin iodide (FASnI 3 ) films with the orthorhombic a ‐axis in the out‐of‐plane direction. Using these highly crystalline films, obtained by mixing a very small amount (0.08 m ) of layered (2D) Sn perovskite with 0.92 m (3D) FASnI 3 , for the first time…

• EC
  European Commission

  Awards: 306983, 626852
• ER
  European Research Council

  Award: 306983