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Unexpected Large Hole Effective Masses in SnSe Revealed by Angle-Resolved Photoemission Spectroscopy.
Lu, Qiangsheng; Wu, Minghui; Wu, Di; Chang, Cheng; Guo, Yan-Ping; Zhou, Chun-Sheng; Li, Wei; Ma, Xiao-Ming; Wang, Gan; Zhao, Li-Dong; Huang, Li; Liu, Chang; He, Jiaqing.
Afiliación
  • Lu Q; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Wu M; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Wu D; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Chang C; School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
  • Guo YP; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Zhou CS; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Li W; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Ma XM; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Wang G; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Zhao LD; School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
  • Huang L; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • Liu C; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
  • He J; Department of Physics, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China.
Phys Rev Lett ; 119(11): 116401, 2017 Sep 15.
Article en En | MEDLINE | ID: mdl-28949203
SnSe has emerged as an efficient thermoelectric material since a high value of the thermoelectric figure of merit (ZT) has been reported recently. Here we show with systematic angle resolved photoemission spectroscopy data that the low-lying electronic structures of undoped and hole-doped SnSe crystals exhibit noticeable temperature variation from 80 to 600 K. In particular, the hole effective masses for the two lowest lying valence band maxima are found to be very large and increase with decreasing temperature. Thermoelectric parameters derived from such hole-mass enhancement agree well with the transport values, indicating comprehensively a reduced impact of multivalley transport to the system's thermoelectric performance.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2017 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2017 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos