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. 2020 Mar 3;7:8. doi: 10.1186/s40580-020-0218-x

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Band energy diagram of Bi₂Te₃, Pt, and Au before contact. The band gap, electron affinity, and ionization potential of Bi₂Te₃ and the work function of Pt and Au are estimated from their bulk values; b Equilibrium band alignment of Bi₂Te₃ and Pt after contact; c Equilibrium band alignment of Bi₂Te₃ and Au after contact. No interface defect states are taken into account