What is it about?

Thermoelectric effects allow us directly convert heat energy into electricity and vice versa. Thermoelectric devices are made by semiconductor materials with different properties, namely n-type and p-type. For the same purpose, thermosize effects and devices have been conceptually and theoretically proposed in literature as new effects/devices without considering any specific material. They are based on quantum size effects and made by the same materials having different sizes. In this study, for the first time in literature, we consider one of the best material, graphene nanoribbons, for these effects to obtain some realistic results for a specific material. We show that thermosize voltage is in the range of mV/K which is high enough for a possible experimental verification and device applications of these effects.

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Why is it important?

Thermosize effects are the recently proposed new effects and it is necessary to calculate these effects by considering a specific material to understand their strength in reality and the possibility of their experimental verification as well as their device applications. Graphene is one of the best candidates to experimentally verify these effects.

Perspectives

We hope this article encourages and convinces the experimentalists to verify thermosize effects and also the theoreticians to consider different materials to understand the realistic nature of thermosize effects. We are looking forward to see real devices based on these quantum effects.

Altug Sisman
Uppsala Universitet

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This page is a summary of: Thermosize voltage induced in a ballistic graphene nanoribbon junction, Journal of Applied Physics, September 2019, American Institute of Physics, DOI: 10.1063/1.5111504.
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