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김동석,김성남,김기원,임기식,강희성,곽은환,이정희,이성길,하종봉 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.52
An AlGaN/GaN-based normally-off GaN metal-oxide-semiconductor field-effect transistor (MOSFET) with a p-GaN buffer layer and using an over-recessed gate structure has been demonstrated for the first time. The p-GaN buffer layer is believed to have advantages of not only ensuring a fairly positive threshold voltage due to the depletion effect but also reducing the buffer leakage current. The over-recessed gate region and the whole surface of the AlGaN layer were covered with a high-quality atomic layer-deposited (ALD) Al_2O_3 layer, which play a role as an excellent gate insulator in the recessed gate region and a surface passivation layer in the ungated region between the source and the drain. The fabricated GaN MOSFET with 30-nm-thick ALD Al_2O_3 exhibited good device performances, such as a maximum drain current of 109 mA/mm, a maximum extrinsic transconductance of 30 mS/mm, a low specific on-resistance of 1.86 mΩ·cm^2, and a subthreshold slope of 365 mV/dec with a threshold voltage of 2.6 V.