Work

Optimization of Thermoelectric Performance of Graphene Nanoribbons by Controlling Nano Structure

Year: 2016

Type: article

Abstract: 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 Cd. For example, at room temperature, PF of zigzag-edged GNRs at the Fermi energy shows a maximum value of 33 mW/(m K2) when Cd = 10% and L = 210 nm. Both the maximum PF and optimum L decrease with increasing Cd. The maximum PF is theoretically explained in terms of the crossover from the ballistic transport regime to the Anderson's localization regime.

Source: Hyomen Kagaku

DOI: 10.1380/jsssj.37.348

Authors: Tetsumi IZAWA, Kengo TAKASHIMA, Takahiro YAMAMOTO

Institution: Tokyo University of Science

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: diamond

Funder: Japan Society for the Promotion of Science

Award: Computational design of high-performance thermoelectric materials and ultra-low power consumption devices