硅雪崩光电探测器工作寿命试验及失效分析研究

摘要

Through FMEA analysis and accelerating lifetime testing,two primary failure modes of silicon avalanche photoelectric detectors were determined:excess of dark current and disqualification of pre-amplifer voltage.Failure analysis shows that:the change of internal atmosphere,due to high temperature stress,causes the dark current unnormal,especially large amount of hydrogen;damage of transistors in pre-amplifier caused by large current is main reason of disqualification of pre-amplifier voltage.%通过 FMEA 分析和加速寿命试验，确定了硅雪崩光电探测器的主要失效模式有两种，一种是暗电流超标，另一种是前放输出电压不合格；对这两种失效模式进行了失效分析，认为是高温应力引起器件内部气氛的变化，主要是氢气含量变大引起器件暗电流不合格；大电流引起前置放大电路上晶体管损伤是前放输出电压不合格的原因。