Over 200 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> of electron inversion channel mobility for AlSiO/GaN MOSFET with nitrided interface
Kenji Ito, Shiro Iwasaki, Kazuyoshi Tomita, Emi Kano, Nobuyuki Ikarashi, Keita Kataoka, Daigo Kikuta, Tetsuo Narita
Abstract
Abstract By controlling a metal-oxide-semiconductor interface of an AlSiO/GaN system, the electron inversion channel mobility was significantly improved to 229 cm 2 V −1 s −1 in a field-effect transistor. A 3 nm thick AlN interlayer formed by atomic layer deposition effectively suppressed the oxidation of the GaN surface and reduced the border traps, resulting in high channel mobility. An additional nitrogen radical treatment before AlN deposition further improved the subthreshold slope and the channel mobility, which was consistent with the lower charged defects extracted from the mobility analysis in the low effective normal field region.