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Radiation induced offstate leakage in the shallow trench isolation regions of SIMC 0.18 μm nMOSFETs is studied as a function of dose rate. A "true" dose rate effect (TDRE) is observed. Increased damage is observed at low dose rate (LDR) than at high dose rate (HDR) when annealing is taken into account. A new method of simulating radiation induced degradation in shallow trench isolation (STI) is presented. A comparison of radiation induced offstate leakage current in test nMOSFETs between total dose irradiation experiments and simulation results exhibits excellent agreement. The investigation results imply that the enhancement of the leakage current may be worse for the dose rate encountered in the environment of space. 相似文献
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在分析同步动态随机存储器(SDRAM)辐射效应主要失效现象的基础上,研制了具备了读写功能测试、刷新周期测试及功耗电流测试三种功能的SDRAM辐射效应在线测试系统,并开展了SDRAM的总剂量效应实验研究。结果表明,总剂量效应会导致SDRAM器件的数据保持时间不断减小,功耗电流不断增大以及读写功能失效。实验样品MT48LC8M32B2的功能失效主要由外围控制电路造成,而非存储单元翻转。数据保持时间虽然随着辐照剂量的累积不断减小,但不是造成该器件功能失效的直接原因。 相似文献
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Three methods for simulating low dose rate irradiation are presented and experimentally verified by using 0.18 μm CMOS transistors.The results show that it is the best way to use a series of high dose rate irradiations, with 100 °C annealing steps in-between irradiation steps, to simulate a continuous low dose rate irradiation.This approach can reduce the low dose rate testing time by as much as a factor of 45 with respect to the actual 0.5 rad(Si)/s dose rate irradiation.The procedure also provides detailed information on the behavior of the test devices in a low dose rate environment. 相似文献
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对65 nm互补金属氧化物半导体工艺下不同尺寸的N型和P型金属氧化物半导体场效应晶体管(NMOSFET和PMOSFET)开展了不同偏置条件下电离总剂量辐照实验.结果表明:PMOSFET的电离辐射响应与器件结构和偏置条件均有很强的依赖性,而NMOSFET表现出较强的抗总剂量性能;在累积相同总剂量时,PMOSFET的辐照损伤远大于NMOSFET.结合理论分析和数值模拟给出了PMOSFET的辐射敏感位置及辐射损伤的物理机制. 相似文献
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文章研究了CMOS器件^60Coγ射线的总剂量辐照实验以及辐照后在100℃温度场下的退火效应。实验发现,辐照后,器件在加温和加偏条件下,可以加速n沟器件界面态的增长和氧化物陷阱电的退火,而加温浮空偏置条件下有利于n沟器件界面态的退火,但在100℃温度场中,两种偏置条件都有利于p沟器件氧化物陷阱电荷和界面的退火。 相似文献