The DC and RF performances of short-gate AlGaN/GaN high-electron transistors (HEMT) on SiC and sapphire substrates have been investigated. There were differences in surface morphology, electron mobility, and contact resistance between SiC and sapphire wafers. The contact resistance limited and dispersed measured transconductance (gm). The intrinsic gm after subtraction of the source resistance contribution and gate-length dependences of cut-off frequency were the same. These results indicates that the effective electron velocity is the same for both samples.
|Number of pages||4|
|Journal||Physica Status Solidi (C) Current Topics in Solid State Physics|
|Publication status||Published - 2006|
|Event||6th International Conference on Nitride Semiconductors, ICNS-6 - Bremen, Germany|
Duration: 2005 Aug 28 → 2005 Sept 2
ASJC Scopus subject areas
- Condensed Matter Physics