Gate Leakage Current Reduction With Advancement of Graded Barrier AlGaN/GaN HEMT

Authors Palash Das , Dhrubes Biswas
Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India
Issue Volume 3, Year 2011, Number 1, Part 5
Dates Received 04 February 2011, published online 08 December 2011
Citation Palash Das, Dhrubes Biswas, J. Nano- Electron. Phys. 3 No1, 972 (2011)
PACS Number(s) 81.05.Ea, 73.61.Ey, 77.84.Bw, 71.10.Ca
Keywords GaN (35) , AlGaN (5) , HEMT (4) , 2DEG, Critical thickness, Graded barrier, Gate Leakage current.
The gate leakage current reduction solution of AlGaN/GaN HEMT device issue has been addressed in this paper with compositional grading of AlGaN barrier layer. This work is also conjugated with the critical thickness limitation of heterostructure material growth. Hence, critical thickness calculation of AlGaN over GaN has been kept in special view. 1D Schrodinger and Poisson solver was used to calculate the 2DEG concentration and effective location to use it in the ATLAS device simulator for the predictions. The proposed Al0.50Ga0.50N/Al0.35Ga0.65N/Al0.20Ga0.80N/GaN HEMT structure exhibits the leakage current of the order of around 15 nA/mm at gate voltage of 1 V.

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