Evaporation of Eco-Friendly MoS2 Nanofilm for Interface Engineering in Carbon-Based Sb2(S,Se)3 Solar Cell

The reported high efficiency antimony chalcogenides devices are chronically adopted with organic hole transport layers (HTLs, i.e., Spiro-OMeTAD) because of their superior hole mobility and adequate energetic alignment. However, the high moisture sensitivity and high cost of organic HTLs will hinder their large scale application. Herein, a low-cost and stable carbon electrode is used as the back contact material for wide bandgap Sb2(S,Se)3 solar cells, and an eco-friendly MoS2 nanofilm with a suitable band structure and excellent carrier mobility is then employed to regulate the interface of Sb2(S,Se)3/carbon in terms of energy level alignment and carrier transportation. The thermal evaporated MoS2 effectively alleviates the serious recombination and remarkably improves the photoelectric conversion efficiency of wide bandgap Sb2(S,Se)3 thin-film solar cells by 50%, finally achieving an impressive efficiency of 6.1% with VOC of 0.76 V, JSC of 13.5 mA/cm2, and FF of 59%, which is among the highest efficiencies of carbon-based Sb2(S,Se)3 solar cells.