P A P E R    T I T L E
Progress in SiC Materials and Microwave Devices

A U T H O R  /  C R E D I T S
J.W. Palmour, S.T. Allen, R.A. Sadler, W.L. Pribble, S.T. Sheppard, and C.H. Carter, Jr.
Cree Research, Inc., 4600 Silicon Drive
Durham, NC 27703, USA
Tel: 1 (919) 361-5709, FAX: 1 (919) 361-2266
e-mail: john_palmour@cree.com

A B S T R A C T
Significant progress has been achieved in making larger (2 inch) 4H-SiC substrates with much lower micropipe defect densities. With the recent availability of semi-insulating 4H-SiC substrates, the demonstration of impressive microwave power results have been made possible both in SiC MESFETs and in GaN/AlGaN HEMTs grown on these substrates. SiC MESFETs have achieved RF power densities of 4.6 W/mm and 4.3 W/mm at 3.5 GHz and 10 GHz, respectively. The largest total RF output power from a single MESFET is 80 watts CW at 3.1 GHz. GaN/AlGaN HEMTs fabricated on these substrates have demonstrated a record 6.9 W/mm at 10 GHz, and a total RF output power of 9.1 watts CW at 7.4 GHz .