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Indentation fracture toughness of single-crystal Bi2Te3 topological insulators

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Abstract

Bismuth telluride (Bi2Te3) is one of the most important commercial thermoelectric materials. In recent years, the discovery of topologically protected surface states in Bi chalcogenides has paved the way for their application in nanoelectronics. Determination of the fracture toughness plays a crucial role for the potential application of topological insulators in flexible electronics and nanoelectromechanical devices. Using depth-sensing nanoindentation tests, we investigated for the first time the fracture toughness of bulk single crystals of Bi2Te3 topological insulators, grown using the Bridgman-Stockbarger method. Our results highlight one of the possible pitfalls of the technology based on topological insulators.

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Authors and Affiliations

  1. Department of Mechanical, Energy and Management Engineering, University of Calabria, Ponte P. Bucci, Cubo 44C, 87036, Rende, Italy

    Caterina Lamuta & Leonardo Pagnotta

  2. Department of Physics, University of Calabria, Ponte P. Bucci, Cubo 31C, 87036, Rende, Italy

    Anna Cupolillo & Antonio Politano

  3. Institute of Catalysis and Inorganic Chemistry, ANAS, AZ1143, Baku, Azerbaijian

    Ziya S. Aliev & Mahammad B. Babanly

  4. Institute of Physics, ANAS, AZ1143, Baku, Azerbaijian

    Ziya S. Aliev

  5. Donostia International Physics Center (DIPC), Paseo de Manuel Lardizabal 4, 20018, San Sebastián/Donostia, Spain

    Ziya S. Aliev & Evgueni V. Chulkov

  6. Departamento de Fisica de Materiales, Universidad del Pais Vasco, Apartado 1072, 20080, San Sebastián/Donostia, Spain

    Evgueni V. Chulkov

  7. Centro de Fisica de Materiales CFM-Materials Physics Center MPC, Centro Mixto CSIC-UPV/EHU, Paseo de Manuel Lardizabal 5, 20018, San Sebastián/Donostia, Spain

    Evgueni V. Chulkov

  8. Saint Petersburg State University, 198504, Saint Petersburg, Russian Federation

    Evgueni V. Chulkov

  9. Tomsk State University, 634050, Tomsk, Russian Federation

    Evgueni V. Chulkov

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  1. Caterina Lamuta
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Lamuta, C., Cupolillo, A., Politano, A. et al. Indentation fracture toughness of single-crystal Bi2Te3 topological insulators. Nano Res. 9, 1032–1042 (2016). https://doi.org/10.1007/s12274-016-0995-z

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