Article Dielectric permittivity, conductivity and breakdown field of hexagonal boron nitride

A Pierret ; D Mele ; H Graef ; J Palomo ; T Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; K Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Y Li ; B Toury ; C Journet ; P Steyer ; V Garnier ; A Loiseau ; J-M Berroir ; E Bocquillon ; G Fève ; C Voisin ; E Baudin ; M Rosticher ; B Plaçais

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A Pierret, D Mele, H Graef, J Palomo, T Taniguchi, K Watanabe, Y Li, B Toury, C Journet, P Steyer, V Garnier, A Loiseau, J-M Berroir, E Bocquillon, G Fève, C Voisin, E Baudin, M Rosticher, B Plaçais. Dielectric permittivity, conductivity and breakdown field of hexagonal boron nitride. Materials Research Express. 2022, 9 (6), 065901. https://doi.org/10.1088/2053-1591/ac4fe1
SAMURAI

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(abstract)

In view of the extensive use of hexagonal boron nitride (hBN) in 2D material electronics, it becomes important to refine its dielectric characterization in terms of low-field permittivity and high-field strength and conductivity up to the breakdown voltage. The present study aims at filling this gap using DC and RF transport in two Au-hBN-Au capacitor series of variable thickness in the 10–100 nm range, made of large high-pressure, high-temperature (HPHT) crystals and a polymer derivative ceramics (PDC) crystals. We deduce an out-of-plane low field dielectric constant ε∥ = 3.4 ± 0.2 consistent with the theoretical prediction of Ohba et al., that narrows down the generally accepted window ε∥ = 3–4. The DC-current leakage at high-field is found to obey the Frenkel-Pool law for thermally-activated trap-assisted electron transport with a dynamic dielectric constant ε∥ ≃ 3.1 and a trap energy ΦB ≃ 1.3 eV, that is comparable with standard technologically relevant dielectrics.

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Keyword: Hexagonal boron nitride, dielectric characterization, trap-assisted electron transport

Date published: 2022-06-01

Publisher: IOP Publishing

Journal:

  • Materials Research Express (ISSN: 20531591) vol. 9 issue. 6 065901

Funding:

  • ANR ANR-14-CE08-018-05
  • European Union “Horizon 2020” 881603

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1088/2053-1591/ac4fe1

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Updated at: 2025-02-26 12:30:49 +0900

Published on MDR: 2025-02-26 12:30:49 +0900

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