Abstract
A new high electron mobility transistor (HEMT) using InAlAs/InGaAs grown on GaAs has been successfully realized. This device, with an In content close to 30%, presents several advantages over conventional pseudomorphic HEMT on GaAs and over lattice matched HEMT on InP. To accommodate the mismatch between the active layer and the GaAs substrate, a metamorphic buffer has been grown at low temperature. High electron mobility with high two dimensional electron gas density (25000 cm/sup 2V.s with 3/spl times/10/sup 12/ cm/sup -2/ at 77 K) as well as high Schottky barrier quality (Vb=0.68 V with /spl eta/=1.1) have been obtained. A device with a 0.4/spl times/150 /spl mu/m/sup 2/ gate geometry has shown a transconductance as high as 700 mS/mm at a current density of 230 mA/mm. The measured f/sub T/ was 45 GHz and f/sub max/ was 115 GHz. These values, showing the great potentiality of this structure, are, to the authors knowledge, the first reported for submicrometer gate metamorphic InAlAs/InGaAs/GaAs HEMTs with an indium content of 30%. >
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
