Abstract
Reliability of low and medium power GaAs MESFETs has been evaluated by means of a comprehensive test plan, performed mainly on commercially purchased devices manufactured by different technologies. Main failure mechanisms identified are related to gate metallization and Schottky contacts (metal/GaAs interdiffusion, gate electromigration), ohmic contact degradation (increase of contact resistance, drain/source electromigration), surface effects and high humidity effects. Reliability of low noise HEMTs of different suppliers and technologies has been evaluated by thermal storage at 250 °C. Degradation appears to be dominated for shorter times (<500 hours) by interdiffusion/interfacial effects which affect the Schottky contact and/or cause variations in the 2-DEG concentration, with consequent degradation of Idss and Vp. For longer times (>500 hours) increase in Rs and Rd takes place, which gives raise to an increase in RL and is possibly due to ohmic contacts degradation.
Work partially supported by CNR, Progetto Finalizzato Materiali e Dispositivi per l’Elettronica a Stato Solido.
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© 1990 Kluwer Academic Publishers
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Magistrali, F., Tedesco, C., Zanoni, E. (1990). Failure Mechanisms of GaAs MESFETs and Low-Noise HEMTs. In: Christou, A., Unger, B.A. (eds) Semiconductor Device Reliability. NATO ASI Series, vol 175. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2482-6_13
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