摘要
卫星用元器件在运行过程中长期承受空间低剂量率辐照,为了在实验室条件快速评估半导体器件在空间低剂量率辐照服役环境下的使用寿命,提出一种空间低剂量率辐照加速寿命试验评估方法。以P型沟道VDMOS器件为研究对象、伽马辐照剂量率为加速应力,提出空间辐照环境下VDMOS加速模型,基于退化轨迹和伪失效寿命建立VDMOS的低剂量率寿命分布和可靠性模型。在0.1、0.08、0.06、0.04、0.02 Gy(Si)/s五种高剂量率下进行恒定剂量率应力加速试验,以阈值电压漂移20%为失效阈值,对所提方法进行应用验证,得到VDMOS低剂量率辐照指数加速模型和可靠度函数,且正常服役辐照条件下使用寿命服从正态分布,并推算出可靠度为0.9时,使用寿命为8.99×10^(5) h。
Satellite components are exposed to space low-dose rate radiation for a long time during operation.In order to rapidly assess the longevity of semiconductor devices under space low-dose rate irradiation in laboratory settings,an accelerated life test evaluation approach for space low-dose rate irradiation was proposed.Focusing on P-channel VDMOS devices as the subject of study and utilizing gamma radiation dose rate as the accelerating stressor,a VDMOS acceleration model under space irradiation conditions was developed.Subsequently,a lifetime distribution and reliability model for VDMOS under low-dose rate conditions was established based on degradation trajectory and pseudo-failure lifetime.Acceleration tests at constant dose rates were conducted at five distinct levels:0.1,0.08,0.06,0.04,and 0.02 Gy(Si)/s,with a 20% threshold voltage drift considered as the failure criterion to validate the proposed methodology.Through this process,a low dose rate radiation exponential acceleration model and reliability function for VDMOS were derived.It was determined that the service life of VDMOS devices conforms to a normal distribution under standard service irradiation conditions,projecting a service life of 8.99×10^(5) hours at a reliability level of 0.9.
作者
赵令
锁斌
余航
ZHAO Ling;SUO Bin;YU Hang(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Research Center for Complex Environmental Equipment Reliability of Southwest University of Science and Technology,Mianyang 621010,China;24th Research Institute of China Electronics Technology Group Corporation,Chongqing 400060,China)
出处
《探测与控制学报》
北大核心
2025年第6期119-125,共7页
Journal of Detection & Control
基金
国家自然科学基金项目(U1830133)
西南科技大学科研基金项目(21zx7125)
四川省高效电源变换技术工程研究中心基金项目(JS20231000536)。
关键词
空间辐照
寿命评估
加速模型
剂量率
space radiation
life assessment
acceleration model
dose rate
