Characteristics of Al 2 O 3 /native oxide/n-GaN capacitors by post-metallization annealing

Kazuya Yuge, Toshihide Nabatame, Yoshihiro Irokawa, Akihiko Ohi, Naoki Ikeda, Liwen Sang, Yasuo Koide, Tomoji Ohishi

研究成果: Article

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This work investigated characteristics of Al 2 O 3 /native oxide/n-GaN MOS capacitors by post-metallization annealing (PMA). A native oxide interlayer which composed of ϵ- and γ-Ga 2 O 3 phases (Native oxide) and the reduced amount of one (Reduced) on n-GaN were prepared by cleaning only a sulfuric acid peroxide mixture (SPM) and both SPM and buffered hydrofluoric acid, respectively. The effect of trimethylaluminum precursor on removal of a native oxide layer was not observed during Al 2 O 3 deposition using atomic layer deposition. An as-grown capacitor (Native oxide) exhibited a small flatband voltage (V fb ) hysteresis of ∼30 mV and a large frequency dispersion, suggesting that the initial growth of the Al 2 O 3 resulted in the formation of electrical defects on the GaN surface. Both the V fb hysteresis and frequency dispersion were drastically improved by PMA of the device at 300 °C. The positive fixed charge values (Q IL ) estimated from the relationships between capacitance equivalent thickness and V fb were +6.1 -10 12 and +0.4-1.0 -10 12 cm -2 for as-grown and PMA-processed capacitors in the PMA temperature range of 300 °C-600 °C, respectively. The interface state density (D it ) determined using a conductance method was also significantly reduced (by an order of magnitude) after PMA processing at 300 °C. These trends in the Q IL and D it data were observed in both the Native oxide and Reduced capacitors, indicating that this interlayer does not greatly affect fixed charge generation at the Al 2 O 3 /native oxide and Al 2 O 3 /modified native oxide interfaces. As a result, two types of treatments result in insignificant difference in the electrical properties of the capacitors.

元の言語English
記事番号034001
ジャーナルSemiconductor Science and Technology
34
発行部数3
DOI
出版物ステータスPublished - 2019 1 31

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

フィンガープリント Characteristics of Al <sub>2</sub> O <sub>3</sub> /native oxide/n-GaN capacitors by post-metallization annealing' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

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    Yuge, K., Nabatame, T., Irokawa, Y., Ohi, A., Ikeda, N., Sang, L., Koide, Y., & Ohishi, T. (2019). Characteristics of Al 2 O 3 /native oxide/n-GaN capacitors by post-metallization annealing Semiconductor Science and Technology, 34(3), [034001]. https://doi.org/10.1088/1361-6641/aafdbd