Micro visible photodetectors based on single wall carbon nanotubes/graphene hybrid films

In this work, a micro photodetector is demonstrated by depositing single wall carbon nanotubes (SWCNTs) on the surface of a graphene field-effect transistor (GFET) with buried gate electrode structure. The device exhibits a photoresponsivity (7.4 A/W) in the visible range, which is much higher than that of the photodetectors based on only graphene film (~10
^-3
A/W). Furthermore., a fast response speed (42 ms) and high photoconductive gain (6.9 × 10
⁷
) are obtained. This work provides a simple and cost-effective method to fabricate sensitive visible photodetectors based on all-carbon hybrid films.