The two-dimensional semiconductor Bi2O2Se can be oxidized to create an atomically thin layer of Bi2SeO5 that can be used as the insulator in scaled field-effect transistors.
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Illarionov, Y.Y., Knobloch, T. & Grasser, T. Native high-k oxides for 2D transistors. Nat Electron 3, 442–443 (2020). https://doi.org/10.1038/s41928-020-0464-2
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DOI: https://doi.org/10.1038/s41928-020-0464-2