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The thermoelectric properties of armchair graphene nanoribbons (AGNRs) witharray characteristics are investigated theoretically using the tight-bindingmodel and Green's function technique. The AGNR structures with arraycharacteristics are created by embedding a narrow boron nitride nanoribbon(BNNR) into a wider AGNR, resulting in two narrow AGNRs. This system is denotedas w-AGNR/n-BNNR, where 'w' and 'n' represent the widths of the wider AGNR andnarrow BNNR, respectively. We elucidate the coupling effect between two narrowsymmetrical AGNRs on the electronic structure of w-AGNR/n-BNNR. A notablediscovery is that the power factor of the 15-AGNR/5-BNNR with the minimum widthsurpasses the quantum limitation of power factor for 1D ideal systems. Theenergy level degeneracy observed in the first subbands of w-AGNR/n-BNNRstructures proves to be highly advantageous in enhancing the electrical poweroutputs of graphene nanoribbon devices.

Thermoelectric Properties of Armchair Graphene Nanoribbons with Array Characteristics