共查询到20条相似文献,搜索用时 93 毫秒
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薄栅氮化物的击穿特性 总被引:1,自引:0,他引:1
研究了含 N MOS薄栅介质膜的击穿电场和电荷击穿特性。结果表明 :MOS栅介质中引入一定的 N后 ,能提高介质的电荷击穿强度 ,电荷击穿强度受 N2 O退火温度的制约 ;N对薄栅介质的击穿电场强度影响甚微 ,击穿电场受栅偏压极性的制约。用一定模型解释了实验结果 相似文献
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对埋栅型SIT,为切断栅极和源极(或阴极)之间在外延过程中形成的连体,打开栅电极区,进行外延后的台面刻蚀,对台面刻蚀的深度和形状进行研究;为消除栅墙外划片边界造成的各种寄生效应,在有源区的外面挖深槽,以保证栅源击穿发生在内部、实现击穿接近理论值。对先刻蚀台面还是先刻蚀槽的问题做了实验对比,结果发现先台后槽更有利于器件特性的改善。 相似文献
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高频功率AlGaN/GaN HEMT 的栅结构优化 总被引:2,自引:2,他引:0
本文研究了栅帽、栅源间距对AlGaN/GaN HEMT性能的影响。基于研究结果得出了优化高频功率AlGaN/GaN HEMT栅结构的方法。缩小栅场板可以有效提高器件的增益、截止频率(ft)、最大震荡频率(fmax)。通过减小栅场板长度,栅长0.35 器件的ft达到了30GHz、fmax达到了80GHz。采用tao型栅(栅帽偏向源侧)或者增加栅金属厚度还可以进一步优化 。缩小栅源的距离可以提高饱和漏电流和击穿电压,从而提高器件的输出功率。 相似文献
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利用磁控溅射的方法在p-Si上制备了高k(高介电常数)栅介质HfO2薄膜的MOS电容,对薄栅氧化层电容的软击穿和硬击穿特性进行了实验研究.利用在栅极加恒电流应力的方法研究了不同面积HfO2薄栅介质的击穿特性以及击穿对栅介质的I-V特性和C-V特性的影响.实验结果表明薄栅介质的击穿过程中有很明显的软击穿现象发生,与栅氧化层面积有很大的关系,面积大的电容比较容易发生击穿.分析比较了软击穿和硬击穿的区别,并利用统计分析模型对薄栅介质的击穿机理进行了解释. 相似文献
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工作电解液中影响闪火电压的因素 总被引:4,自引:7,他引:4
从工作电解液闪火机制的研究出发讨论了影响闪火电压的因素。加藤所提出的闪火电压与负离子浓度成反比的理论比传统的闪火电压与电阻率成正比的理论更加完善。负离子浓度、种类影响界面上氧离子的浓度及介质膜的强度。从闪火机制来看,它是对闪火电压更加直接的影响因素。这种理论能够解释混合溶质及界面活性剂等能够提高闪火电压的同时又降低电阻率的本质原因。 相似文献
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使用TCAD仿真软件对3 300 V沟槽栅IGBT的静态特性进行了仿真设计.重点研究了衬底材料参数、沟槽结构对器件击穿电压、电场峰值等参数的影响.仿真结果表明,随衬底电阻率增加,击穿电压增加,饱和电压和拐角位置电场峰值无明显变化;随衬底厚度增加,击穿电压增加,饱和电压增加,拐角位置电场峰值降低;随沟槽宽度增加,饱和电压降低,击穿电压和拐角位置电场峰值无明显变化;随沟槽深度增加,饱和电压降低,击穿电压无明显变化,拐角位置电场峰值增加;随沟槽拐角位置半径增加,击穿电压和饱和电压无明显变化,但拐角位置电场峰值减小.选择合适的衬底材料对仿真结果进行实验验证,实验结果与仿真结果相符,制备的IGBT芯片击穿电压为4 128 V,饱和电压约为2.18 V. 相似文献
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The breakdown voltage in fully depleted SOI n-MOSFET's has been studied over a wide range of film thicknesses, channel dopings, and channel lengths. In lightly-doped films, the breakdown voltage roll-off at shorter channel lengths becomes much less severe as the film thickness is reduced. This is a result of improved resistance to punchthrough and DIBL effects in thinner SOI. Consequently, at channel lengths below about 0.8 μm, ultrathin (50 nm) SOI can provide better breakdown voltages than thicker films. At heavier doping levels the punchthrough and DIBL are suppressed, and there is little dependence of breakdown voltage on film thickness. Two-dimensional simulations have been used to investigate the breakdown behavior in these devices. It is found that the drain-induced barrier lowering affects the breakdown voltage both directly, via punchthrough, and indirectly through its effect on the current flow and hole generation in the high-field regions 相似文献
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The paper examines the assumption that asperites and corners in electrodes can be preferential sites for electrical breakdown of silicon dioxide capacitors. It was assumed for this purpose that asperities can be approximated by spherical surfaces, and the breakdown voltage was then calculated at such asperities. Calculations showed that the breakdown voltage of a planar silicon dioxide capacitor can be lowered by one half to two thirds by asperities, when their radius is less than about one half of the oxide thickness. Such a decrease in the breakdown voltage is widely observed in polysilicon oxide capacitors. The effect of asperities is alleviated by a trapped electron charge, which can increase the breakdown voltage significantly. The spherical asperity model accounted for the breakdown voltages observed on a wide range of polysilicon oxide capacitors with oxide thickness varying from 45 to 820 nm. The radius of asperities responsible for breakdown in these experiments was roughly estimated 25–35 nm. 相似文献
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We report improved breakdown characteristics of InP-based heterostructure field-effect transistors (HFET's) utilizing In0.34 Al0.66As0.85Sb0.15 Schottky layer grown by low-pressure metalorganic chemical vapor deposition. Due to high energy bandgap and high Schottky barrier height (>0.73 eV) of the In0.34Al0.66As0.85Sb0.15 Schottky layer, high two-terminal gate-to-drain breakdown voltage of 40 V, three-terminal off-state breakdown voltage of 40 V three-terminal threshold-state breakdown voltage of 31 V, and three-terminal on-state breakdown voltage of 18 V at 300 K for In0.75Ga0.25As channel, are achieved. Moreover, the temperature dependence of two-terminal reverse leakage current is also investigated. The two-terminal gate-to-drain breakdown voltage is up to 36 V at 420 K. A maximum extrinsic transconductance of 216 mS/mm is obtained with a gate length of 1.5 μm 相似文献
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研究了阶梯变掺杂漂移区高压SOI RESURF(Reduce SURface Field)结构的器件几何形状和物理参数对器件耐压的影响;发现并解释了该结构纵向击穿时,耐压与浓度关系中特有的“多RESURF平台”现象。研究表明,阶梯变掺杂漂移区结构能明显改善表面电场分布,提高耐压,降低导通电阻,增大工艺容差;利用少数分区,能得到接近线性变掺杂的耐压,降低了工艺难度。 相似文献
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A representation based on the similarity relations for voltage breakdown is shown to be useful in combining RF and dc voltage breakdown data. The representation for the uniform field geometry is given. 相似文献