Tunable nano Peltier cooling device from geometric effects using a single graphene nanoribbon

TL;DR

This paper proposes a novel graphene-based Peltier cooling device that leverages geometric effects, specifically curvature-induced doping, to achieve tunable cooling without gating, with predicted power densities comparable to existing superlattice techniques.

Contribution

It introduces a new class of graphene cooling devices utilizing geometry-induced doping effects, avoiding the need for gating, and demonstrates their potential performance through theoretical predictions.

Findings

Cooling power can reach kW/cm2 levels.

Geometry alone can control doping and device behavior.

Predicted performance rivals traditional superlattice-based coolers.

Abstract

Based on the phenomenon of curvature-induced doping in graphene we propose a class of Peltier cooling devices, produced by geometrical effects, without gating. We show how a graphene nanorib- bon laid on an array of curved nano cylinders can be used to create a targeted and tunable cooling device. Using two different approaches, the Nonequlibrium Green's Function (NEGF) method and experimental inputs, we predict that the cooling power of such a device can approach the order of kW/cm2, on par with the best known techniques using standard superlattice structures. The struc- ture proposed here helps pave the way toward designing graphene electronics which use geometry rather than gating to control devices.