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Flicker noise of GaN-based heterostructure field-effect transistors with Si-doped AlGaN carrier injection layer

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6 Author(s)
Yan-Kuin Su ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Sun-Chin Wei ; Ruey-Lue Wang ; Shoou-Jinn Chang
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Aluminum gallium nitride/gallium nitride (AlGaN/GaN) heterostructure field effect transistors (HFETs) with and without Si-doped AlGaN layer were fabricated and investigated. HFETs with the Si-doped AlGaN carrier-injection layer show better DC performance, and the transconductance is 150 mS/mm. However, the HFETs with Si-doped AlGaN layer present the deviation from the 1/f noise at low frequency. The Lorentz shape was observed in the noise spectrum. It suggests that traps might be more pronounced in this kind of structure. Therefore, the DC characteristics of HFETs can be improved by the insertion of Si-doped AlGaN layer, but it can result in more low-frequency noise with the carrier-injection layer.

Published in:

Electron Device Letters, IEEE  (Volume:24 ,  Issue: 10 )

Date of Publication:

Oct. 2003

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