Maximum Thermoelectric Power Factor and Optimal Carrier Concentration of Bilayer Graphene at Various Temperatures

• Horii Hikaru

  Department of Electrical Engineering, Faculty of Engineering, Tokyo University of Science

• Matsubara Manaho

  Department of Physics, Faculty of Science, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science

• Sasaoka Kenji

  Research Institute for Science and Technology, Tokyo University of Science

• Yamamoto Takahiro

  Department of Physics, Faculty of Science, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science

抄録

The thermoelectric response of bilayer graphene over a wide temperature range (0 < T ≤ 400 K) was theoretically investigated using linear response theory combined with a Green's function technique. We found that the power factor PF for a fixed chemical potential μ exhibits a maximum at a certain T. On the other hand, we found that the PF for a fixed T exhibits a maximum (PF_max) at an optimal μ [or optimal carrier concentration (n_opt)]. In addition, we clarified the T dependence of n_opt and PF_max and explained the existence of n_opt in terms of the thermal excitation of electrons between the valence and conduction bands, which cannot be predicted by the conventional Mott formula.

収録刊行物

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 19 (0), 125-130, 2021-12-23

  公益社団法人 日本表面真空学会

キーワード

• <i>Thermoelectric effect</i>
• <i>Seebeck coefficient</i>
• <i>Power factor</i>
• <i>Bilayer graphene</i>
• <i>Linear response theory</i>

詳細情報

• CRID: 1390009018099019392
• NII論文ID: 130008132146
• DOI: 10.1380/ejssnt.2021.125
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/19/0/19_125/_pdf
• 本文言語コード: en
• データソース種別:
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• 抄録ライセンスフラグ: 使用可