High‐Purity Photoactive α‐Phase for Flexible Perovskite Photodetectors with Modified Electron Transport Layer

Abstract Regulating the crystallization process of organic–inorganic halide perovskite is essential for the fabrication of reproducible and efficient optoelectronic devices. Herein, a vacuum‐assisted heating treatment strategy for precursor is developed to obtain a high‐purity photoactive phase perovskite. By eliminating residual H 2 O molecules from raw materials and solvents, the method prevents the Pb–I framework of perovskite from being destroyed. Additionally, the pre‐treated precursor possesses high‐valence iodoplumbate species leading to preferable crystallization for perovskite films. Furthermore, a high on‐off ratio of 1103 is attained under 0 V and 550 nm illumination by employing a vertical n–i–p…

• NN
  National Natural Science Foundation of China

  Award: 62204047
• SK
  State Key Laboratory of Photovoltaic Science and Technology

  Award: 202401030303