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arXiv · 1903.00572

Stable Operation of AlGaN/GaN HEMTs at 400$^\circ$C in air for 25 hours

Saleh Kargarrazi·Ananth Saran Yalamarthy·Peter F. Satterthwaite·Scott William Blankenberg·Caitlin Chapin·Debbie G. Senesky
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Abstract

In this letter, we report the operation of AlGaN/GaN HEMTs with Pd gates in air over a wide temperature range from 22$^\circ$C to 500$^\circ$C. The variation in the threshold voltage ($V_{th}$) is less than 1$\%$ over the entire temperature range. Moreover, a safe biasing region where the transconductance peak ($g_m$) occurs over the entire temperature range was observed, enabling high-temperature analog circuit design. Furthermore, the operation of the devices over 25 hours was experimentally studied, demonstrating the stability of the DC characteristics and $V_{th}$ at 400$^\circ$C. Finally, the degradation mechanisms of HEMTs at 500$^\circ$C over 25 hours of operation are discussed, and are shown to be associated with the 2DEG sheet density and mobility decrease.

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Saleh Kargarrazi, Ananth Saran Yalamarthy, Peter F. Satterthwaite, Scott William Blankenberg, Caitlin Chapin, Debbie G. Senesky. 2019-03-01. Stable Operation of AlGaN/GaN HEMTs at 400$^\circ$C in air for 25 hours. https://arxiv.org/abs/1903.00572

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