Direct growth of SnS 2 nanowall photoanode for high responsivity self-powered photodetectors.

Tin sulfide (SnS 2 ) has attracted growing attention due to its environmental friendliness, tunable band gap and potential applications for high-sensitivity photodetectors. However, the low responsivity and slow response speed severely hinder its further applications. In this work, SnS 2 nanowalls have been successfully fabricated on FTO substrates by a facile hydrothermal approach. The prepared SnS 2 nanowalls were used as a photoanode material for photoelectrochemical (PEC)-type photodetectors. The SnS 2 based PEC-type photodetectors exhibit excellent photocurrent density (39.06 μA cm -2 ), responsivity (1460 μA W -1 ), long-term cycling stability and self-powered behavior. The responsivity of the detector is higher than that of most reported SnS 2 based PEC-type photodetectors and even some SnS 2 based photoconductive photodetectors. The high responsivity and self-powered behavior enable the extended potential applications of SnS 2 in PEC-type photodetectors.