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Tuning Thermoelectric Properties of Single Wall Carbon Nanotubes by Electric Double Layer Carrier Injection

Yanagi, Kazuhiro (Tokyo Metropolitan University, Tokyo, JPN); Oshima, Yuki (Tokyo Metropolitan University, Tokyo, JPN); Kitamura, Yoshimasa (Tokyo Metropolitan University, Tokyo, JPN); Nakamura, Masatoshi (Tokyo Metropolitan University, Tokyo, JPN); Kawai, Hideki (Tokyo Metropolitan University, Tokyo, JPN); Maniwa, Yutaka (Tokyo Metropolitan University, Tokyo, JPN)

Thermoelectrics are a very important technology for efficiently converting waste heat into electric power. Hicks and Dresselhaus proposed an important approach to innovate the performance of thermoelectric devices, which involves using onedimensional materials and properly tuning their Fermi level (PRB 1993). Therefore, understanding the relationship between the thermoelectric performance and the Fermi level of one-dimensional materials is of great importance to maximize their thermoelectric performance. Single wall carbon nanotube (SWCNT) is an ideal model for one-dimensional materials. Previously we reported continuous p-type and n-type control over the Seebeck coefficients of semiconducting SWCNT networks with diameter of 1.4 nm through an electric double layer transistor setup using an ionic liquid as the electrolyte (Yanagi et al, Nano Lett. 14, 6437 2014, Appl. Phys. Lett. 107, 043106 2015). We clarified the thermoelectric properties of semiconducting SWCNTs with diameter of 1.4 nm as a function of Fermi level. In this study, we investigated how the chiralities and electronic structures of SWCNTs influence on the thermoelectric properties. We found the significant difference between the thermoelectric properties of SWCNTs with different electronic structures.

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