# Determination of the self-compensation ratio of carbon in AlGaN for HEMTs

Ben Rackauskas*, Michael J. Uren, Steve Stoffels, Ming Zhao, Stefaan Decoutere, Martin Kuball

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

22 Citations (Scopus)

## Abstract

Epitaxial AlGaN/GaN/AlGaN-on-Si high-electron mobility structures with and without carbon doping have been studied. By considering the donor density required to suppress a 2D hole gas in the undoped structure, we demonstrate that the $2 \times 10^{19}$ cm-3 substitutional carbon incorporated during metal-organic chemical vapor deposition must be a source of donors as well as acceptors, with a donor to acceptor ratio of at least 0.4. This compensation ratio was determined based on the comparison of substrate bias experiments with TCAD simulations. This value, which was previously unknown, is a key parameter in GaN power switching high- electron- mobility transistors, since it determines the resistivity of the layer used to suppress leakage and increase breakdown voltage.

Original language English 1838-1842 5 IEEE Transactions on Electron Devices 65 5 27 Mar 2018 https://doi.org/10.1109/TED.2018.2813542 Published - 1 May 2018

• CDTR

## Keywords

• 2D hole gas (2DHG)
• AlGaN
• Carbon
• Compensation
• GaN
• Self-compensation

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• ### B. Rackauskas et al. TED 2018

Rackauskas, B. (Creator) & Kuball, M. H. H. (Data Manager), University of Bristol, 8 Mar 2018

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