Photo-Thermoelectric Effect Of Graphene Nanoribbon Nanodevice

the thermoelectric effect of strained graphene nanoribbon nanodevice is investigated. This nanodevice is modeled as: A graphene nanoribbon is connected to two metallic leads. These two metallic leads operate as a source and drain. The conducting substance is the gate electrode in this three terminal nanodevice. Another metallic gate is used to govern the electrostatics and the switching of graphene nanoribbon channel. The substances at the graphene nanoribbon/ metal contact are controlled by the back gate. The Seebeck and Nernst coefficients, electronic thermal conductance, electrical conductance, figure of merit and the efficiency are computed at different temperature. Results show that both Seebeck coefficient and figure of merit of the present nanodevice are enhanced due to the induced tensile uniaxial strain. This is because of the reduced values of the electronic thermal conductance due to the induced tensile strain. So the present results show an enhancement of the thermoelectric properties of the present investigated nanodevice. As a consequence of our results, we might predict that the strained graphene nanoribbon is a promising nanomaterial for thermal to electrical energy conversion. Keywords—Seebeck and Nernst coefficients; electronic thermal conductance; figure of merit; thermoelectric efficiency; armchair and zigzag graphene nanoribbons.