DataVXACS NanoPaper
journal article·2025-08-19

Multiple ZT Peaks Caused by van Hove Singularities in Semiconducting Carbon Nanotube Films

Kan Ueji, Shojiro Asatori, Yota Ichinose, Rikuto Abe, Yuichiro Yamashita, Shigeki Saito, Yohei Yomogida, Satoshi Kusaba, Takashi Yagi, Geoff Wehmeyer, Junichiro Kono, Kazuhiro Yanagi

ACS Nano· Volume 19· Issue 32
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Source abstract

Abstract

The ZT figure-of-merit is an index for thermoelectric conversion efficiency that incorporates the Seebeck coefficient, electrical conductivity, and thermal conductivity. In conventional three-dimensional materials, ZT exhibits a local maximum at only one carrier density because these three thermoelectric parameters each have counteracting trends with carrier concentration. Therefore, optimizing the doping level to the single peak in the ZT value is a general strategy to improve the thermoelectric conversion efficiency. Here we show that such a conventional single-peak ZT result is not observed for materials with strong quantum confinement effects. Specifically, we present here a double-peak structure of ZT values observed in films of semiconducting single-walled carbon nanotubes (SWCNTs). The ZT value can be enhanced when the Fermi level is near the van Hove singularities (vHs) in the density of states of the SWCNTs. Using electrolyte gating to shift the Fermi level systematically, we observe two local maxima in ZT corresponding to the two vHs. Such multiple-peak characteristics of the ZT value in quantum materials will alter the concept for improving the thermoelectric conversion efficiency.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storageNanomaterials

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermal Radiation and Cooling Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Graduate School of Science, Tokyo Metropolitan University, 1-1 minami-Osawa, Hachioji, Tokyo 192-0397, Japan

National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan

Department of Mechanical Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States

Smalley−Curl Institute

Rice University

Rice Advanced Materials Institute

Department of Physics and Astronomy

Department of Material Science and NanoEngineering

Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States

Funding

Core Research for Evolutional Science and Technology · Thermal and Electric Energy Technology Foundation · Precise Measurement Technology Promotion Foundation · Japan Society for the Promotion of Science · Japan Science and Technology Agency · National Science Foundation · Shimadzu Science Foundation

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