Ti doped Sb2S3 thin film for improved performance of inorganic-organic hybrid solar cells

•Ti doping Sb2S3 films without oxide/hydroxide were prepared by the spin-casting.•Solar cells structure of FTO/TiO2/Ti:Sb2S3/P3HT/Al is fabricated.•The performance of Sb2S3 based solar cells is great improved by Ti doping. The inorganic-organic hybrid solar cells based on Ti doped antimony sulfide (Ti:Sb2S3) was prepared by a simple spin-castingmethod. Compared with that of the devices with the pristine Sb2S3, the power conversion efficiency (PCE) of the devices based on Ti:Sb2S3 was increased by 41%. The different Ti doping concentration impact on the performance of the devices was investigated. PCE of the cells was improved with Ti doping concentration increased until Ti concentration exceeds 6%, the highest PCE reaches to 2.70%. The better performance of the devices based on Ti:Sb2S3 is due to the improved optical absorption, and the decreased dangling bonds on the surface of the Ti:Sb2S3 thin film.