文献类型：期刊文献

英文题名：Thermoelectric properties of hexagonal graphene quantum dots

作者：Yan, Yonghong[1];Liang, Qi-Feng[1];Zhao, Hui[2];Wu, Chang-Qin[3]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Tongji Univ, Dept Phys, Shanghai 200092, Peoples R China;[3]Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

年份：2012

卷号：376

期号：12-13

起止页码：1154

外文期刊名：PHYSICS LETTERS A

收录：SCI-EXPANDED(收录号：WOS:000301763500013)、、EI(收录号：20202208737974)、Scopus(收录号：2-s2.0-84862816648)、WOS

基金：Q.L. was supported by NSFC (Grant No. 10904092). H.Z. was partially supported by National Natural Science Foundation of China (Grant No. 10904112).

语种：英文

外文关键词：Thermoelectric property; Hexagonal graphene quantum dot; ZT

外文摘要：By using the atomistic nonequilibrium Green's function method, we investigate the thermoelectric properties of graphene nanoribbons in the presence of two constrictions (or hexagonal graphene quantum dots). With decreasing widths of the constrictions, the thermal conductance of the nanoribbon can be reduced largely while S(2)G(e) (S is the Seebeck coefficient and G(e) is the electronic conductance) remains still high as compared with the results of the pristine nanoribbon. Thus, the thermoelectric figure of merit ZT can be enhanced largely. In fact, in the presence of narrowest constrictions the ZT values of the zigzag quantum dots can exceed one at room temperature, while the ZT values of the armchair quantum dots may be close to one, depending on the size of the dot. (C) 2012 Elsevier B.V. All rights reserved.