Solvent-Mediated Crystallization of CH 3 NH 3 SnI 3 Films for Heterojunction Depleted Perovskite Solar Cells

Organo-lead halide perovskite solar cells have gained enormous significance and have now achieved power conversion efficiencies of ∼20%. However, the potential toxicity of lead in these systems raises environmental concerns for widespread deployment. Here we investigate solvent effects on the crystallization of the lead-free methylammonium tin triiodide (CH3NH3SnI3) perovskite films in a solution growth process. Highly uniform, pinhole-free perovskite films are obtained from a dimethyl sulfoxide (DMSO) solution via a transitional SnI2·3DMSO intermediate phase. This high-quality perovskite film enables the realization of heterojunction depleted solar cells based on mesoporous TiO2 layer but in the absence of…

• NS
  National Science Foundation
• UD
  U.S. Department of Energy
• NU
  Northwestern University
• OO
  Office of Science
• MR
  Materials Research Science and Engineering Center, Harvard University
• DO
  Division of Materials Research
• BE
  Basic Energy Sciences

  Award: DE-SC0001059
• EF
  Energy Frontier Research Centers