Mixed Sulfur and Iodide-Based Lead-Free Perovskite Solar Cells

The use of divalent chalcogenides and monovalent halides as anions in a perovskite structure allows the introduction of 3 + and 4 + charged cations in the place of the 2 + metal cations. Herein we report for the first time on the fabrication of solar cells exploiting methylammonium antimony sulfur diiodide (MASbSI 2 ) perovskite structures, as light harvesters. The MASbSI 2 was prepared by annealing under mild temperature conditions, via a sequential reaction between antimony trisulfide (Sb 2 S 3 ), which is deposited by the chemical bath deposition (CBD) method, antimony triiodide (SbI 3 ), and methylammonium iodide (MAI) onto a mesoporous TiO 2 electrode, and then annealed at 150 °C in an argon atmosphere. The solar cells fabricated using MASbSI 2 exhibited power conversion efficiencies (PCE) of 3.08%, under the standard illumination conditions of 100 mW/cm 2 .