关键词: 温度循环试验, 功率器件, 可靠性, 失效机理

Abstract: Power devices are the core components of power electronic systems, and their reliability is crucial. Current research on the failure mechanisms of power devices under temperature cycling (TC) loads is still insufficient. Therefore, a method combining experimental characterization with failure mechanism analysis is adopted to investigate the failure modes and mechanisms of power devices under temperature cycling loads, which provides a theoretical foundation and technical reference for the reliability design and lifetime prediction of subsequent power devices. The principles, objectives, and methods of the TC test are introduced. The devices are subjected to the TC test, and electrical parameter data are collected. Failure analysis on electrically failed devices reveals that cracks in the passivation layer allow moisture to penetrate the chip interior, ultimately leading to thermal breakdown of the devices. Corresponding improvement strategies for the passivation layer are proposed from both material and process perspectives, providing technical guidance for product development.

Key words: temperature cycling test, power devices, reliability, failure mechanisms