On-state breakdown in power HEMT's: Measurements and modeling

被引:40
作者
Somerville, MH
Blanchard, R
del Alamo, JA
Duh, KG
Chao, PC
机构
[1] MIT, Cambridge, MA 02139 USA
[2] Sanders, Nashua, NH 03061 USA
关键词
breakdown; HEMT; impact ionization; MODFET;
D O I
10.1109/16.766868
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We have carried out a systematic study of on-state breakdown in a sample set of InAlAs/InGaAs HEMT's using a new gate current extraction technique in conjunction with sidegate and temperature-dependent measurements. We find that as the device is turned on, the breakdown voltage limiting mechanism changes from a TFE-dominated process to a multiplication-dominated process. This physical understanding allows the creation of a phenomenological physical model for breakdown which agrees well with all our experimental results, and explains the relationship between BVon, and the sheet carrier concentration. Our results suggest that depending on device design, either on-state or off-state breakdown can limit maximum power.
引用
收藏
页码:1087 / 1093
页数:7
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