Abstract
Ultraviolet (UV) photodetectors have attracted increasing attention in military and civilian fields.In this work, the prepared TiO2-graphene composite was fabricated by hydrothermal synthesis method and it was used in photoelectrochemical type photodetector for UV detection. The results of the photoelectrochemical measurements demonstrate that the TiO2-graphene composite have a remarkable enhancement on photoresponse compared to pure TiO2, which is effectively demonstrate the introduction of graphene will reduce the probability of electron-hole recombination and increase the photocurrent of light detection. In addition, owing to the unique solid-liquid contact mechanism of PEC-type photodetector, it can work under 0 V bias and exhibited excellent photoresponse ability that can reach11uA/W at the UV wavelength of 365 nm. Moreover, the as-prepared TiO2-graphene composite based photodetector possessed preferable performance with the weak irradiation. Even if the light intensity reduced to 6 mW/cm2, the photocurrent density can also reach to 5 uA/cm2. With the excellent absorbtion of the UV and remarkable self-powered ability make the TiO2-graphene composite based PEC-type photodetector have great promising on UV detection field.
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