Unusually large chemical potential shift in a degenerate semiconductor

Angle-resolved photoemission study of SnSe and Na-doped SnSe

M. Maeda, K. Yamamoto, T. Mizokawa, N. L. Saini, M. Arita, H. Namatame, M. Taniguchi, G. Tan, L. D. Zhao, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have studied the electronic structure of SnSe and Na-doped SnSe by means of angle-resolved photoemission spectroscopy. The valence-band top reaches the Fermi level by the Na doping, indicating that Na-doped SnSe can be viewed as a degenerate semiconductor. However, in the Na-doped system, the chemical potential shift with temperature is unexpectedly large and is apparently inconsistent with the degenerate semiconductor picture. The large chemical potential shift and anomalous spectral shape are key ingredients for an understanding of the novel metallic state with the large thermoelectric performance in Na-doped SnSe.

Original languageEnglish
Article number121110
JournalPhysical Review B
Volume97
Issue number12
DOIs
Publication statusPublished - Mar 23 2018

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Chemical potential
Photoemission
photoelectric emission
Semiconductor materials
shift
Photoelectron spectroscopy
Valence bands
Fermi level
ingredients
Electronic structure
Doping (additives)
electronic structure
valence
spectroscopy
Temperature
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Unusually large chemical potential shift in a degenerate semiconductor : Angle-resolved photoemission study of SnSe and Na-doped SnSe. / Maeda, M.; Yamamoto, K.; Mizokawa, T.; Saini, N. L.; Arita, M.; Namatame, H.; Taniguchi, M.; Tan, G.; Zhao, L. D.; Kanatzidis, Mercouri G.

In: Physical Review B, Vol. 97, No. 12, 121110, 23.03.2018.

Research output: Contribution to journalArticle

Maeda, M. ; Yamamoto, K. ; Mizokawa, T. ; Saini, N. L. ; Arita, M. ; Namatame, H. ; Taniguchi, M. ; Tan, G. ; Zhao, L. D. ; Kanatzidis, Mercouri G. / Unusually large chemical potential shift in a degenerate semiconductor : Angle-resolved photoemission study of SnSe and Na-doped SnSe. In: Physical Review B. 2018 ; Vol. 97, No. 12.
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