Decreased trap density and lower current collapse in AlGaN/GaN HEMTs by adding a magnetron-sputtered AlN gate

Author:

Jia MaoORCID,Zhang He-Nan,Wang XiaoORCID,Liu Chen-Yang,Pu Tao-FeiORCID,Wang Ting-Ting,He Yue,Jiang Feng-Qiu,Fang Ke,Yang LingORCID,Bu Yu-Yu,Li Yang,Ma Xiao-HuaORCID,Ao Jin-Ping,Hao Yue

Abstract

Abstract In this paper, AlN films grown by magnetron sputtering method have been proposed as the gate insulator layer of AlGaN/GaN high electron mobility transistors (HEMTs) to decrease gate leakage current and suppress the interface trap. The effect of the temperature of substrate on the quality of AlN films have been investigated. By inserting the thin AlN film (35 nm) as a gate insulator layer, the on-state resistance of AlGaN/GaN HEMTs decrease from 11.1 Ω mm to 10.3 Ω mm @V g = 0 V, the current collapse decreases from 16.6% to 3.2%, the gate leakage can be reduced from 1.2 × 10−1A mm−1 to 4.4 × 10−6A mm−1 @V g = 2 V by five orders of magnitude, and the fast interface states disappear and the normal trap density decreases from 0.96–1.3 × 1013 cm−2eV−1 to 1.3–3.4 × 1012 cm−2 eV−1, proving that magnetron-sputtered AlN is an effective way to improve the performance of GaN HEMTs.

Funder

National Natural Science Foundation of China

National Natural Science Foundation for Young Scholars of China

Postdoctoral Science Foundation of China

Publisher

IOP Publishing

Subject

Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials

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