Investigating the photocurrent generation and optoelectronic responsivity of WS2-TiO2 heterostructure

Hybridization of WS2 and TiO2 by a facile hydrothermal method was realized to construct WS2-TiO2 heterostructure photodetector which exhibits preferable photoresponse activity in association with structural robustness. The relationship between photocurrent density and applied bias potential has also been uncovered. Photoresponse measurements demonstrate the photocurrent density of WS2-TiO2 hybrid nanosheets (HNs) has been greatly improved when compared to that of as-prepared TiO2, while the steady current density can achieve 130nA∕cm2 when applied potential is 1.0 V. Besides that, the stability test exhibits no detectable distinction after processing 15 cycles. The improved photoresponse activities can be attributed into the positive synergetic effect between the WS2 and TiO2. We hope the present work can provide fundamental implementations about WS2-TiO2 heterostructure photodetector, meanwhile, offering it potential availabilities for constructing high-performance photodetectors.