Nm-scale measurements of fast surface potential transients in an AlGaN/GaN high electron mobility transistor

Fast, bias-induced, surface potential transients (SPTs) and conductance transients (CTs) were simultaneously measured on an AlGaN/GaN high electron mobility transistor. SPTs measured near the drain-side gate edge and CTs have nearly the same shape and are well-fit with two exponentials having room-t...

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Bibliographic Details
Published in:Applied physics letters 2012-05, Vol.100 (19), p.193507-193507-4
Main Authors: Cardwell, D. W., Arehart, A. R., Poblenz, C., Pei, Y., Speck, J. S., Mishra, U. K., Ringel, S. A., Pelz, J. P.
Format: Article
Language:English
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Summary:Fast, bias-induced, surface potential transients (SPTs) and conductance transients (CTs) were simultaneously measured on an AlGaN/GaN high electron mobility transistor. SPTs measured near the drain-side gate edge and CTs have nearly the same shape and are well-fit with two exponentials having room-temperature time constants of 4.2ms and 36ms, likely indicating emission from two trap species. Kelvin probe force microscopy was used to measure SPTs. Electrostatic simulations of SPT amplitudes, which account for the measured probe/sample geometry, are consistent with a uniform trapped surface charge density of 7×10 12 electrons/cm 2 extending 200nm from the drain-side gate edge.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4714536