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• W4328048492 abstract "A high-quality ultrathin dielectric film is important in the field of microelectronics. We designed a composite structure composed of Al2O3/HfO2 with different Al2O3/HfO2 cycles prepared by atomic layer deposition (ALD) to obtain high-quality ultrathin (1–12 nm) dielectric films. Al2O3 protected HfO2 from interacting with the Si substrate and inhibited the crystallization of the HfO2 film. High permittivity material of HfO2 was adopted to guarantee the good insulating property of the composite film. We investigated the physical properties as well as the growth mode of the composite film and found that the film exhibited a layer growth mode. The water contact angle and grazing-incidence small-angle X-ray scattering analyses revealed that the film was formed physically at 3 nm, while the thickness of the electrically stable film was 10 nm from grazing-incidence wide-angle X-ray scattering and dielectric constant analyses. The composite film was applied as a dielectric layer in thin-film transistors (TFTs). The threshold voltage was decreased to 0.27 V compared to the organic field-effect transistor with the single HfO2 dielectric, and the subthreshold swing was as small as 0.05 V/dec with a carrier mobility of 49.2 cm2/V s. The off-current was as low as 10–11 A, and the on/off ratio was as high as 5.5 × 106. This ALD-prepared composite strategy provides a simple and practical way to obtain the high-quality dielectric film, which shows the potential application in the field of microelectronics." @default.
• W4328048492 created "2023-03-22" @default.
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• W4328048492 date "2023-03-21" @default.
• W4328048492 modified "2023-10-08" @default.
• W4328048492 title "Physical Properties of an Ultrathin Al₂O₃/HfO₂ Composite Film by Atomic Layer Deposition and the Application in Thin-Film Transistors" @default.
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• W4328048492 doi "https://doi.org/10.1021/acsami.2c22227" @default.
• W4328048492 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36942855" @default.
• W4328048492 hasPublicationYear "2023" @default.
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