Solid-state nanocrystalline solar cells composed of chemical-bath-deposited Sb2S3 (antimony sulfide) as a light absorber layer deposited on nano-porous TiO2 and spiro-MeOTAD as an organic hole-transporting material yielded a solar conversion efficiency of 5.2% at 0.1 sun illumination and a peak 88% of the incident monochromatic photon-to-current conversion efficiency.