TY - JOUR
T1 - Unusually large chemical potential shift in a degenerate semiconductor
T2 - Angle-resolved photoemission study of SnSe and Na-doped SnSe
AU - Maeda, M.
AU - Yamamoto, K.
AU - Mizokawa, T.
AU - Saini, N. L.
AU - Arita, M.
AU - Namatame, H.
AU - Taniguchi, M.
AU - Tan, G.
AU - Zhao, L. D.
AU - Kanatzidis, M. G.
N1 - Funding Information:
The authors would like to thank Y. Chiba and S. Suzuki for their contributions in the early stage of this work. This work was supported by CREST-JST (Grant No. JPMJCR15Q2). At Northwestern University, this work is supported by the U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences under Award No. DE-SC0014520 (crystal growth and characterization of samples). The synchrotron radiation experiment was performed with the approval of HiSOR (2015-A-5).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/3/23
Y1 - 2018/3/23
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.97.121110
DO - 10.1103/PhysRevB.97.121110
M3 - Article
AN - SCOPUS:85044465821
SN - 2469-9950
VL - 97
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 12
M1 - 121110
ER -