Universality of the giant Seebeck effect in organic small molecules

Hirotaka Kojima; Ryo Abe; Fumiya Fujiwara; Mario Nakagawa; Kohtaro Takahashi; Daiki Kuzuhara; Hiroko Yamada; Yumi Yakiyama; Hidehiro Sakurai; Tatsuya Yamamoto; Hidenori Yakushiji; Masaaki Ikeda; Masakazu Nakamura

doi:10.1039/C7QM00596B

Universality of the giant Seebeck effect in organic small molecules†

Hirotaka Kojima,

*^a Ryo Abe,^a Fumiya Fujiwara,^a Mario Nakagawa,^a Kohtaro Takahashi,^a Daiki Kuzuhara,

^b Hiroko Yamada,

^a Yumi Yakiyama,

^c Hidehiro Sakurai,

^c Tatsuya Yamamoto,^d Hidenori Yakushiji,^d Masaaki Ikeda^d and Masakazu Nakamura

*^ae

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* Corresponding authors

^a Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
E-mail: kojimah@ms.naist.jp, mnakamura@ms.naist.jp
Fax: +81-743-72-6047
Tel: +81-743-72-6031

^b Department of Materials Science and Engineering, Faculty of Science and Engineering, Iwate University, Morioka, Iwate 020-8551, Japan

^c Division of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

^d Center for Innovative Research, Nippon Kayaku Co., Ltd, Tokyo 115-8588, Japan

^e Research Center of Integrative Molecular Systems, Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan

Abstract

To explore the universality of the giant Seebeck coefficient (>100 mV K⁻¹) found in our previous study with pure C₆₀ thin films, the thermoelectric properties of high-mobility small-molecule organic semiconductors and their temperature dependencies are investigated. Consequently, various pure organic semiconductors exhibited similar large Seebeck coefficients within the temperature range of 300–360 K. The magnitude of the Seebeck coefficient, its intense temperature dependence, and correlation with the activation energy of electrical conductivity are unique and cannot be elucidated by currently known physical models of thermoelectricity.

This article is part of the themed collection: Pi conjugated system bricolage (figuration) toward functional organic molecular systems

Materials Chemistry Frontiers

Universality of the giant Seebeck effect in organic small molecules†

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Universality of the giant Seebeck effect in organic small molecules

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