Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe

Takanobu Nagayama, Kensei Terashima, Takanori Wakita, Hirokazu Fujiwara, Tetsushi Fukura, Yuko Yano, Kanta Ono, Hiroshi Kumigashira, Osamu Ogiso, Aichi Yamashita, Yoshihiko Takano, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Kazuhiko Kuroki, Yuji Muraoka, Takayoshi Yokoya

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Synchrotron-based angle-resolved photoemission spectroscopy is used to determine the electronic structure of layered SnSe, which was recently turned out to be a potential thermoelectric material. We observe that the top of the valence band consists of two nearly independent hole bands, whose tops differ by ∼20 meV in energy, indicating the necessity of a multivalley model to describe the thermoelectric properties. The estimated effective masses are anisotropic, with in-plane values of 0.16-0.39 m 0 and an out-of-plane value of 0.71 m 0, where m 0 is the rest electron mass. Information of the electronic structure is essential to further enhance the thermoelectric performance of hole-doped SnSe.

    Original languageEnglish
    Article number010301
    JournalJapanese Journal of Applied Physics
    Volume57
    Issue number1
    DOIs
    Publication statusPublished - Jan 2018

    ASJC Scopus subject areas

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

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