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024 7 _ |2 DOI
|a 10.1016/j.vacuum.2011.07.016
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082 _ _ |a 530
084 _ _ |2 WoS
|a Materials Science, Multidisciplinary
084 _ _ |2 WoS
|a Physics, Applied
100 1 _ |0 P:(DE-Juel1)128613
|a Mikulics, M.
|b 0
|u FZJ
245 _ _ |a Electrical and structural characterization of AlGaN/GaN field-effect transistors with recessed gate
260 _ _ |a Amsterdam [u.a.]
|b Elsevier Science
|c 2012
300 _ _ |a 754 - 756
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440 _ 0 |0 5896
|a Vacuum
|v 86
|x 0042-207X
|y 6
500 _ _ |3 POF3_Assignment on 2016-02-29
500 _ _ |a The work reported here was supported by the Slovak Scientific Grant Agency VEGA (Contract Nos. 1/0866/11 and 2/0098/09) and the Centre of Excellence CENAMOST (VVCE-0049-07).
520 _ _ |a Performance of AlGaN/GaN heterostructure field-effect transistors (HFETs) with recessed gate was investigated and compared with non-recessed counterparts. Optimal dry etch conditions by plasma assisted Ar sputtering were found for similar to 6 nm gate recess of a 20 nm thick AlGaN barrier layer. A decrease of the residual strain after the gate recessing (from -0.9 GPa to -0.68 GPa) was evaluated from the photoluminescence measurement. The saturation drain current at the gate voltage V-G = 1 V decreased from 1.05 A/mm to 0.85 A/mm after the recessing. The gate voltage for a maximal transconductance (240-250 mS/mm) has shifted from -3 V for non-recessed HFETs to -0.2 V for recessed counterparts. Similarly, the threshold voltage increased after the gate recessing. A decrease of the sheet charge density from 1 x 10(13) cm(-2) to 4 x 10(12) cm(-2) at V-G = 0 V has been evaluated from the capacitance measurements. The RF measurements yielded a slight increase of the cut-off frequencies after the gate recessing. All these indicate that the gate recessing is a useful tool to optimize the AlGaN/GaN HFET performance for high-frequency applications as well as for the preparation of normally-off devices. (C) 2011 Elsevier Ltd. All rights reserved.
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653 2 0 |2 Author
|a Gallium nitride
653 2 0 |2 Author
|a Plasma assisted etching
653 2 0 |2 Author
|a Electrical properties
653 2 0 |2 Author
|a Photoluminescence
653 2 0 |2 Author
|a Transistor
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|a Fox, A.
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|a Marso, M.
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|a Grützmacher, D.
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|a Donoval, D.
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|a Kordos, P.
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|t Vacuum
|v 86
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856 7 _ |u http://dx.doi.org/10.1016/j.vacuum.2011.07.016
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