Synthesis of near-infrared silver-indium-sulfide (AgInS2) quantum dots as heavy-metal free photosensitizer for solar cell applications

► Photosensitized solar cells based on silver-indium-sulfide (AgInS2) QDs has been demonstrated for the first time. ► Electron injection from photoexcited AgInS2 QDs to TiO2 is energetically favorable and produces photocurrents accordingly. ► Non-toxic heavy-metal-free quantum dot sensitizers.