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We analyze electronic and phononic quantum transport through zigzag or chiralgraphene nanoribbons (GNRs) perforated with an array of nanopores. Since localcharge current profiles in these GNRs are peaked around their edges, drillingnanopores in their interior does not affect such edge charge currents whiledrastically reducing heat current carried by phonons in sufficiently longwires. The combination of these two effects can yield highly efficientthermoelectric devices with maximum $ZT \simeq 11$ at liquid nitrogentemperature and $ZT \simeq 4$ at room temperature achieved in $\sim 1$ $\mu$mlong zigzag GNRs with nanopores of variable diameter and spacing between them.Our analysis is based on the $\pi$-orbital tight-binding Hamiltonian with up tothird nearest-neighbor hopping for electronic subsystem, the empiricalfourth-nearest-neighbor model for phononic subsystem, and nonequilibrium Greenfunction formalism to study quantum transport in both of these models.

Edge currents and nanopore arrays in zigzag and chiral graphene nanoribbons as a route toward high-$ZT$ thermoelectrics