Cited by 647Advanced Thermoelectric Materials and DevicesTopological Materials and Phenomena2D Materials and Applications

p -type Bi 2 Se 3 for topological insulator and low-temperature thermoelectric applications

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Hor, Y. S., Richardella, A., Roushan, P., Xia, Y., Checkelsky, J. G., Yazdani, A., Hasan, M. Z., Ong, N. P. +1 more·2009·Physical Review B

Abstract

The growth and elementary properties of $p$-type ${\text{Bi}}_{2}{\text{Se}}_{3}$ single crystals are reported. Based on a hypothesis about the defect chemistry of ${\text{Bi}}_{2}{\text{Se}}_{3}$, the $p$-type behavior has been induced through low-level substitutions (1% or less) of Ca for Bi. Scanning tunneling microscopy is employed to image the defects and establish their charge. Tunneling and angle-resolved photoemission spectra show that the Fermi level has been lowered into the valence band by about 400 meV in ${\text{Bi}}_{1.98}{\text{Ca}}_{0.02}{\text{Se}}_{3}$ relative to the $n$-type material. $p$-type single crystals with $ab$-plane Seebeck coefficients of $+180\text{ }\ensuremath{\mu}\text{V}/\text{K}$ at room temperature are reported. These crystals show an anomalous peak in the Seebeck coefficient at low temperatures, reaching $+120\text{ }\ensuremath{\mu}\text{V}\text{ }{\text{K}}^{\ensuremath{-}1}$ at 7 K, giving them a high thermoelectric power factor at low temperatures. In addition to its interesting thermoelectric properties, $p$-type ${\text{Bi}}_{2}{\text{Se}}_{3}$ is of substantial interest for studies of technologies and phenomena proposed for topological insulators.

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Authors
Hor, Y. S., Richardella, A., Roushan, P., Xia, Y., Checkelsky, J. G., Yazdani, A., Hasan, M. Z., Ong, N. P., & Cava, R. J.
Affiliations
Princeton University (US)
Venue
Physical Review B
Published
2009-05-21
Volume
79
Issue
19
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W2007208171
Cited by
647
References
23
Citations by year
2026: 16 · 2025: 18 · 2024: 26 · 2023: 21 · 2022: 34 · 2021: 29 · 2020: 42 · 2019: 36 · 2018: 38 · 2017: 41 · 2016: 53 · 2015: 48 · 2014: 58 · 2013: 48 · 2012: 56
FWCI
22.20
Type
journal article
Language
en
Open access
Locations
  • Physical Review B (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Advanced Thermoelectric Materials and Devices
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
Keywords
Bi2Se3, topological insulators, thermoelectric properties, Seebeck coefficient, thermoelectric power factor, low-temperature thermoelectricity, calcium substitution, defect chemistry, Fermi level position, single crystal growth, scanning tunneling microscopy, angle-resolved photoemission

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