[14a-B12-1~11] 22.1 Joint Session M "Phonon Engineering"

△ [14a-B12-7] Edge-Disorder-Induced Optimization of Thermoelectric Performance of Finite-Length Graphene Nanoribbons

〇Tetsumi Izawa¹, Kengo Takashima¹, Takahiro Yamamoto¹ (1.Touri Univ.)

Keywords:thermoelectricity, graphene nanoribbons, Anderson's localization

Effects of edge disorder on thermoelectric performance of graphene nanoribbons (GNRs) were investigated through computational simulations based on the non-equilibrium Green’s function method combined with the tight-binding approximation. We found that the thermoelectric power factor PF can be optimized by adjusting the ribbon length, L, of GNRs with edge disorder concentration C_d. For example, at room temperature, PF of zigzag-edged GNRs at the Fermi energy shows a maximum value of 33 mW/(m K²) when C_d = 10 % and L = 210 nm. Both the maximum PF and optimum L decrease with increasing C_d. The maximum PF is theoretically explained in terms of the crossover from the ballistic transport regime to the Anderson’s localization regime.