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Part I: Physical Insight Into Carbon-Doping-Induced Delayed Avalanche Action in GaN Buffer in AlGaN/GaN HEMTs

Joshi, Vipin and Tiwari, Prakash and Shrivastava, Mayank (2019) Part I: Physical Insight Into Carbon-Doping-Induced Delayed Avalanche Action in GaN Buffer in AlGaN/GaN HEMTs. In: IEEE TRANSACTIONS ON ELECTRON DEVICES, 66 (1). pp. 561-569.

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Official URL: https://doi.org/10.1109/TED.2018.2878770


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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: Acceptor traps; AlGaN/GaN HEMTs; breakdown voltage; buffer designing; carbon-doping; donor traps; self-compensating traps
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited: 28 Jan 2019 09:15
Last Modified: 28 Jan 2019 09:15
URI: http://eprints.iisc.ac.in/id/eprint/61477

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