Enhancement of photoconversion efficiency and light harvesting ability of TiO2 nanotube-arrays with Cu2ZnSnS4

We report an underpotential deposition (UPD) route of Cu2ZnSnS4/TiO2 nanotube arrays (TiO2-NTAs) in which the Kesterite (Cu2ZnSnS4) was employed as a sensitizer to enhance photoconversion efficiency TiO2-NTAs. Cu2ZnSnS4 simultaneously coated on TiO2-NTAs by depositing its constituent metals from precursor ions via electrochemical atomic layer (EC-ALD) and subsequent annealing. The detailed synthesis process, surface morphology, crystalline structure, photoelectrochemical properties hydrogen production rate as-prepared Cu2ZnSnS4/TiO2-NTAs were discussed. Thickened TiO2 nanotubes observed, suggesting that coating about 5 ± 0.5 nm. results showed light harvesting has obvious improvement after sensitizing them with Cu2ZnSnS4. In comparison pure TiO2-NTAs, two-fold increment achieved using composite Cu2ZnSnS4/TiO2-NTAs. novel photoanode CZTS/TiO2 NTAs maximum generation 49 ml h−1 cm−2.