期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 66, 期 1, 页码 561-569出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2018.2878770
关键词
Acceptor traps; AlGaN/GaN HEMTs; breakdown voltage; buffer designing; carbon-doping; donor traps; self-compensating traps
资金
- Department of Science and Technology, Government of India through Technology Systems Development Programme's [DST/TSG/AMT/2015/294]
Physics behind the improvement in breakdown voltage of AlGaN/GaN HEMTs with carbon-doping of GaN buffer is discussed. Modeling of carbon as acceptor traps and self-compensating acceptor/donor traps is discussed with respect to their impact on avalanche breakdown. Impact of carbon behaving as a donor as well as acceptor traps on electric field relaxation and avalanche generation is discussed in detail to establish the true nature of carbon in GaN that delays the avalanche action. This understanding of the behavior of carbon-doping in GaN buffer is then utilized to discuss design parameters related to carbon doped buffer. Design parameters such as undoped channel thickness and relative trap concentration induced by carbon-doping are discussed with respect to the performance metrics of breakdown voltage, leakagecurrent, sheet charge density, and dynamic ON-resistance.
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