Detectors for visible and UV applications based on graphene nanowiggles

Abstract

Employing the self-consistently solution using non-equilibrium Green’s function method, we simulate the optoelectronic transport properties of different graphene nanowiggles (GNWs) under the monochromatic illumination with photon energy less than 5eV. Numerical results show that by varying the shape of GNWs, due to the change of size of these nanostructures and the geometry of their edges, they will appear different electronic properties from semiconductor with significant energy gap to metallic-like behaviour. So, these nanostructures can be usable for various optoelectronic applications and designing the related nanodevices. Also, comparison the value of quantum efficiency peaks; belong to allowable optical transitions, reveals that the most probable transitions of GNWs occur for illumination in the range of violet and UV wavelengths. So, the phototransistor based on these GNWs could be useful as UV photodetector. Although, it should be noted that some of their designs, more than UV application, appear photodetection behaviour in the range of visible spectrum.