Antimony sulfide-selenide (Sb₂(S,Se)₃) is a kind of semiconducting material with earth abundant element storage, good long-term stability, and tunable band gap in 1.1-1.8 eV. In principle, it is an excellent light absorption material and can deliver maximum efficiency of >30% according to the Shockley-Queisser limit. The major challenge in this kind of device is to boost the efficiency to a level comparable to the established solar technologies such as thin film solar cells and perovskite solar cells. In this research, we focus on the development of synthetic methodologies toward Sb₂(S,Se)₃, device fabrication and efficiency improvement.