Enhanced Thermoelectric Performance of As-Grown Suspended Graphene Nanoribbons

Qin Yi Li, Tianli Feng, Wakana Okita, Yohei Komori, Hiroo Suzuki, Toshiaki Kato, Toshiro Kaneko, Tatsuya Ikuta, Xiulin Ruan, Koji Takahashi

研究成果: ジャーナルへの寄稿記事

4 引用 (Scopus)

抜粋

Conventionally, graphene is a poor thermoelectric material with a low figure of merit (ZT) of 10-4-10-3. Although nanostructuring was proposed to improve the thermoelectric performance of graphene, little experimental progress has been accomplished. Here, we carefully fabricated as-grown suspended graphene nanoribbons with quarter-micron length and â40 nm width. The ratio of electrical to thermal conductivity was enhanced by 1-2 orders of magnitude, and the Seebeck coefficient was several times larger than bulk graphene, which yielded record-high ZT values up to â0.1. Moreover, we observed a record-high electronic contribution of â20% to the total thermal conductivity in the nanoribbon. Concurrent phonon Boltzmann transport simulations reveal that the reduction of lattice thermal conductivity is mainly attributed to quasi-ballistic phonon transport. The record-high ratio of electrical to thermal conductivity was enabled by the disparate electron and phonon mean free paths as well as the clean samples, and the enhanced Seebeck coefficient was attributed to the band gap opening. Our work not only demonstrates that electron and phonon transport can be fundamentally tuned and decoupled in graphene but also indicates that graphene with appropriate nanostructures can be very promising thermoelectric materials.

元の言語英語
ページ(範囲)9182-9189
ページ数8
ジャーナルACS nano
13
発行部数8
DOI
出版物ステータス出版済み - 8 27 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • これを引用

    Li, Q. Y., Feng, T., Okita, W., Komori, Y., Suzuki, H., Kato, T., Kaneko, T., Ikuta, T., Ruan, X., & Takahashi, K. (2019). Enhanced Thermoelectric Performance of As-Grown Suspended Graphene Nanoribbons. ACS nano, 13(8), 9182-9189. https://doi.org/10.1021/acsnano.9b03521