共查询到16条相似文献,搜索用时 140 毫秒
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测量了应力前后GaAs PHEMT器件电特性的退化,指出了GaAs PHEMT阈值电压的退化由两个原因引起.栅极下AlGaAs层深能级的空穴积累可以解释阈值电压漂移中暂时性的、可恢复的那部分,积累在栅金属与半导体之间界面层的空穴可以解释阈值电压漂移中永久性的漂移.空穴积累来源于场助作用下电子的退陷和沟道中碰撞电离产生的空穴向栅极流动时被俘获.对高场下碰撞电离率的实验曲线进行拟合,得到碰撞电离率与器件沟道电场峰值的量化关系,可以对GaAs PHEMT器件的电性能和可靠性进行评估. 相似文献
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GaAs PHEMT器件的退化特性及可靠性表征方法 总被引:2,自引:0,他引:2
测量了应力前后Ga As PHEMT器件电特性的退化,指出了Ga As PHEMT阈值电压的退化由两个原因引起.栅极下Al Ga As层深能级的空穴积累可以解释阈值电压漂移中暂时性的、可恢复的那部分,积累在栅金属与半导体之间界面层的空穴可以解释阈值电压漂移中永久性的漂移.空穴积累来源于场助作用下电子的退陷和沟道中碰撞电离产生的空穴向栅极流动时被俘获.对高场下碰撞电离率的实验曲线进行拟合,得到碰撞电离率与器件沟道电场峰值的量化关系,可以对Ga As PHEMT器件的电性能和可靠性进行评估 相似文献
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脉冲应力增强的NMOSFET's热载流子效应研究 总被引:1,自引:0,他引:1
本文研究了交流应力下的热载流子效应,主要讨论了脉冲应力条件下的热空穴热电子交替注入对NMOSFET's的退化产生的影响.在脉冲应力下,阈值电压和跨导的退化增强.NMOSFET's在热空穴注入后,热电子随后注入时,会有大的退化量,这可以用中性电子陷阱模型和脉冲应力条件下热载流子注入引起的栅氧化层退化来解释.本文还定量分析研究了NMOSFET's退化与脉冲延迟时间和脉冲频率的关系,并且给出了详细的解释.在脉冲应力条件下,器件的热载流子退化是由低栅压下注入的热空穴和高栅压下热电子共同作用的结果. 相似文献
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本文研究了交流应力下的热载流子效应 ,主要讨论了脉冲应力条件下的热空穴热电子交替注入对NMOSFET′s的退化产生的影响 .在脉冲应力下 ,阈值电压和跨导的退化增强 .NMOSFET′s在热空穴注入后 ,热电子随后注入时 ,会有大的退化量 ,这可以用中性电子陷阱模型和脉冲应力条件下热载流子注入引起的栅氧化层退化来解释 .本文还定量分析研究了NMOSFET′s退化与脉冲延迟时间和脉冲频率的关系 ,并且给出了详细的解释 .在脉冲应力条件下 ,器件的热载流子退化是由低栅压下注入的热空穴和高栅压下热电子共同作用的结果 相似文献
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Sandia National Laboratories, Albuquerque, NM 87185 Photocurrent multiplication measurements have been performed on two different
In0.2Gao0.8As/GaAs strained-layer superlattice (SLS)p
+n photodiode structures which are designed to permit simultaneous injection of electrons and holes. Initial devices were found
to suffer from low quantum efficiencies produced by small electron diffusion lengths as well as mixed injection caused by
lower than expected optical absorption coefficients in the SLSn
+ contact layers for hole injection conditions. Using a second device structure having a thicker n+ contact region, the electron multiplication factors are found to be larger than that of holes with a ratio of the electron
to hole ionization coefficient of 1.4 for fields between 2.9 and 3.4 x 105V/cm. 相似文献
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SOI NLIGBT中热载流子效应分别通过直流电压的应力测试、TCAD仿真和电荷泵测试三种方法进行了研究。其中,不同直流电压应力条件下测得的衬底电流Isub和导通电阻Ron用来评估因热载流子效应引起的器件退化程度。为了进行理论分析,对器件内部的电场强度和碰撞离化率也进行了仿真。测试得到的电荷泵电流直接验证了器件表面的损伤程度。最后讨论了SOI LIGBT在不同栅压条件下的退化机制。 相似文献
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Toyota Y. Matsumura M. Hatano M. Shiba T. Ohkura M. 《Electron Devices, IEEE Transactions on》2010,57(2):429-436
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Experimental evidence, based on sensitively modulating the concentration of the high-energy tail of the electron energy distribution, reveals an important trend in the mid-to-high gate stress voltage (V/sub g/) regime, where device degradation is seen to continuously increase with the applied V/sub g/, for a given drain stress voltage V/sub d/. The shift in the worst-case degradation point from V/sub g//spl ap/V/sub d//2 to V/sub g/=V/sub d/, depicting an uncorrelated behavior with the substrate current, is caused by the injection of the high-energy tail electrons into the gate oxide, when the oxide field near the drain region becomes increasingly favorable as V/sub g/ approaches V/sub d/. This letter offers an improved framework for understanding the worst-case hot-carrier stress degradation of deep submicrometer N-MOSFETs under low bias condition. 相似文献
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Neugroschel A. Chih-Tang Sah Carroll M.S. 《Electron Devices, IEEE Transactions on》1996,43(8):1286-1290
Experimental evidences are given which demonstrate that degradation of the common-emitter forward current gain hFE of submicron silicon npn bipolar transistors at low reverse emitter-base junction applied voltage is caused by primary hot holes of the n+ /p emitter tunneling current rather than secondary hot electrons generated by the hot holes or thermally-generated hot electrons. Experiments also showed similar kinetic energy dependence of the generation rate of oxide/silicon interface traps by primary hot electrons and primary hot holes. Significant hFE degradation was observed at stress voltages less than 2.4 V 相似文献
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Hastas N.A. Dimitriadis C.A. Brini J. Kamarinos G. 《Electron Devices, IEEE Transactions on》2002,49(9):1552-1557
The effects of low gate voltage |Vg| stress (Vg =-2.5 V, Vd=-12 V) and high gate voltage |Vg| stress (Vg=Vd=-12 V) on the stability of short p-channel nonhydrogenated polysilicon TFTs were studied. The degradation mechanisms were identified from the evolution with stress time of the static device parameters and the low-frequency drain current noise spectral density. After low |Vg| stress, transconductance overshoot, kinks in the transfer characteristics, and positive threshold voltage shift were observed. Hot-electron trapping in the gate oxide near the drain end and generation of donor-type interface deep states in the channel region are the dominant degradation mechanisms. After high |Vg| stress, transconductance overshoot and "turn-over" behavior in the threshold voltage were observed. Hot-electron trapping near the drain junction dominates during the initial stages of stress, while channel holes are injected into the gate oxide followed by interface band-tail states generation as the stress proceeds 相似文献