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Caractérisation de MOSFETs de puissance cyclés en avalanche pour des applications automobiles micro-hybrides

Abstract : Research work presented in this thesis concern the conception and the study of low voltage power MOSFETs for micro hybrid vehicles (starter alternator). For some of these applications, developed transistors must be able to operate in classical ON and OFF state mode and in avalanche mode at high current and high temperature. To reproduce this operating mode, MOSFETs are submitted to a specific repetitive UIS test. In order to evaluate silicon's temperature during this test, several temperature measurement methods have been developed and compared. In parallel, in order to understand the impact of repetitive avalanche on the transistor, standard electrical parameters (BVDSS, IDSS, RDSon&) are monitored during the test. The only parameter that seems to be shifting with the number of cycles is the RDSon. This phenomenon is due to the measurement method and to a variation of source metallization resistance during cycling. Indeed several observations have shown source metallization ageing and a shift in its resistivity. Different metallization and assembly parameters have been tested to limit this phenomenon. Also various test structures have been designed to study metallization evolution and to compare different metallization behaviors.
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  • HAL Id : tel-00509151, version 1

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Beatrice Bernoux. Caractérisation de MOSFETs de puissance cyclés en avalanche pour des applications automobiles micro-hybrides. Micro et nanotechnologies/Microélectronique. INSA de Toulouse, 2010. Français. ⟨tel-00509151⟩

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