Capacitance-voltage characterization of La2O3 metal-oxide-semiconductor structures on In0.53Ga0.47As substrate with different surface treatment methods

Dariush Zade, Takashi Kanda, Koji Yamashita, Kuniyuki Kakushima, Hiroshi Nohira, Parhat Ahmet, Kazuo Tsutsui, Akira Nishiyama, Nobuyuki Sugii, Kenji Natori, Takeo Hattori, Hiroshi Iwai

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    Abstract

    We studied InGaAs surface treatment using hexamethyldisilazane (HMDS) vapor or (NH4)2S solution after initial oxide removal by hydrofluoric acid. The effect of each treatment on interface properties of La2O3/In0.53Ga0.47As metal-oxide-semiconductor (MOS) capacitor was evaluated. We found that HMDS surface treatment of InGaAs, followed by La2O3 deposition and forming gas annealing reduces the MOS capacitor's interface state density more effectively than (NH4)2S treatment. The comparison of the capacitance-voltage data shows that the HMDS-treated sample reaches a maximum accumulation capacitance of 2.3μF/cm2 at 1 MHz with roughly 40% less frequency dispersion near accumulation, than the sample treated with (NH4)2S solution. These results suggest that process optimization of HMDS application could lead to further improvement of InGaAs MOS interface, thereby making it a potential routine step for InGaAs surface passivation.

    Original languageEnglish
    JournalJapanese journal of applied physics
    Volume50
    Issue number10 PART 2
    DOIs
    Publication statusPublished - 2011 Oct 1

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

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    Zade, D., Kanda, T., Yamashita, K., Kakushima, K., Nohira, H., Ahmet, P., Tsutsui, K., Nishiyama, A., Sugii, N., Natori, K., Hattori, T., & Iwai, H. (2011). Capacitance-voltage characterization of La2O3 metal-oxide-semiconductor structures on In0.53Ga0.47As substrate with different surface treatment methods. Japanese journal of applied physics, 50(10 PART 2). https://doi.org/10.1143/JJAP.50.10PD03