Insight into the liquid state of organo-lead halide perovskites and their new roles in dye-sensitized solar cells

Abstract

Here we report that organo-lead halide perovskite CH₃NH₃PbI_(3−x)Cl_x solution can be used as a new liquid electrolyte in dye-sensitized solar cells (DSCs). We find that the presence of inorganic octahedra of [PbX₆]⁴⁻ (X = I or Cl, or a combination of them) in this perovskite solution can not only remarkably improve the device stability but also enhance the photo-response of DSCs.