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

Abstract

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 Sb 2 (S,Se) 3 solar cells, and an eco-friendly MoS 2 nanofilm with a suitable band structure and excellent carrier mobility is then employed to regulate the interface of Sb 2 (S,Se) 3 /carbon in terms of energy level alignment and carrier transportation. The thermal evaporated MoS 2 effectively alleviates the serious recombination and remarkably improves the photoelectric conversion efficiency of wide bandgap Sb 2 (S,Se) 3 thin-film solar cells by 50%, finally achieving an impressive efficiency of 6.1% with V OC of 0.76 V, J SC of 13.5 mA/cm 2 , and FF of 59%, which is among the highest efficiencies of carbon-based Sb 2 (S,Se) 3 solar cells.