Enhanced Electrical Conductivity of Sb₂S₃ Thin Film via C₆₀ Modification and Improvement in Solar Cell Efficiency

Sb₂S₃ has attracted great research interest very recently as a promising absorber material for photoelectric and photovoltaic devices because of its unique optical and electrical properties and single, stable phase. However, the intrinsic high resistivity property of Sb₂S₃ material is one of the major factors restricting the further improvement of its application. In this work, the C₆₀ modification of Sb₂S₃ thin films is investigated. The conductivity of Sb₂S₃ thin films increases from 4.71 × 10^-9 S cm^-1 for unmodified condition to 2.86 × 10^-8 S cm^-1 for modified thin films. Thin-film solar cells in the configuration of glass/(SnO₂:F) FTO/TiO₂/Sb₂S₃(C₆₀)/Spiro-OMeTAD/Au are fabricated, and the conversion efficiency is increased from 1.10% to 1.74%.