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During turn-off, the drain current in an IGBT will exhibit different behaviors depending on whether the carrier lifetime in the drift region is longer or shorter

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During turn-off, the drain current in an IGBT will exhibit different behaviors depending on whether the carrier lifetime in the drift region is longer or shorter. Qualitatively sketch

the drain current versus time during turn-off for a short-lifetime IGBT and for a longlifetime IGBT and explain the reasons for the differences.