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Changes of Electrical Characteristics for AlGaN/GaN HEMTs Under Uniaxial Tensile Strain

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6 Author(s)
Chia-Ta Chang ; Dept. of Mater. Sci. & Eng., Nat. Chiao-Tung Univ., Hsinchu ; Shih-Kuang Hsiao ; Edward Yi Chang ; Chung-Yu Lu
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This letter investigates the characteristics of unpassivated AlGaN/GaN high-electron mobility transistors (HEMTs) under uniaxial tensile strain. Mechanical stress can produce additional charges that change the HEMT channel current. This phenomenon is dependent upon gate orientation and may be the result of the piezoelectric effect and changes in electron mobility due to the applied uniaxial stress. In addition, results show that tensile strain reduces the transient current, which is likely due to the additional donorlike surface states created through the piezoelectric effect.

Published in:

IEEE Electron Device Letters  (Volume:30 ,  Issue: 3 )