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通过作者最近建立的关于电力半导体器件 GAT的集电结耗尽层电位分布和电场分布的二维解析模型即《GAT栅屏蔽效应二维解析模型》、《GAT实现高频率与高基区穿通电压兼容特性分析》以及《GAT实现高电流增益与高雪崩击穿电压兼容特性分析》,定量研究了优化设计 GAT的材料参数和结构参数的关系。 相似文献
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通过保角变换方法,对具有椭圆锥形发射体的真空微电子二极管进行了研究,求得了二极管区域内电位分布和电场分布的解析表达式,进而得到了电场强度和场致发射电流密度与尖端曲率之间的关系。 相似文献
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为研究气球周围大气电场分布,分析气球对空中大气电场探测的影响,建立了不带电气球和带电气球的电场分布模型,通过边界条件和气球周围电荷分布分别求解拉普拉斯方程和泊松方程,利用MATLAB模拟计算气球周围电场的分布情况,对比分析表明:气球带电后对上下部位的电场有加强作用,对左右两侧的电场分布有削弱的作用.同时,分析了气球升空过程中体积的变化和介电常数的改变对气球周围大气电场强度的影响,结果表明,探空绳长取20 m最优,此时气球造成的电场强度误差为0.33%. 相似文献
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三电极碳纳米管传感器各电极之间的间距大小是影响检测精度的关键因素之一。在用传感器阵列检测多组分气体混合物时,各传感器的极间距很难确定。为三电极碳纳米管气体传感器提出一种基于粒子群算法(PSO)的极间距优化方法。该方法包括设计极间距、组建由不同极间距的多个传感器组成的传感器阵列、建立包括极间距及检测离子电流的数据库、建立混合气体定量分析模型及极间距优化等步骤。采用多组由不同极间距的三个碳纳米管传感器构成的传感器阵列对NO和SO2 混合气体进行测量,其中各传感器的极间距均采用上述方法优化。实验结果显示,上述极间距优化方法能够有效地选择电极之间的最佳间距,优化极间距后的传感器也获得了更高的检测灵敏度。 相似文献
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Ying Lan Baoqing Zeng Hai Zhang Beiran Chen Zhonghai Yang 《Journal of Infrared, Millimeter and Terahertz Waves》2006,27(6):871-877
A novel THz antenna structure, made of carbon nanotube arrays is suggested. Using CST MICROWAVE STUDIO (CST MWS), the capabilities of carbon nanotube terahertz (THz) antenna arrays have been simulated. The dependence of gain, upon geometrical factors, e.g., nanotube diameter, nanotube length and the inter-tubes distance, is shown. The directivity patterns of antenna arrays and the surface current distribution of an antenna have been shown by simulation. These results could be used in the design of carbon nanotube THz antenna arrays. 相似文献
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In this paper, we modified carbon nanotubes with the thiol‐reactive species, subsequently combined the thiol‐coupling reaction and reversible addition‐fragmentation chain transfer (RAFT) polymerization to prepare temperature‐responsive PNIPAAm (poly(N‐isopropylacrylamide))‐carbon nanotube conjugates. The prepared PNIPAAm‐carbon nanotube conjugates have temperature‐responsive PNIPAAm chain, and disulfide linkages between PNIPAAm and carbon nanotube which are sensitive to bio‐stimuli such as glutathione, therefore dual‐responsive polymer‐carbon nanotube conjugates have been prepared. 相似文献
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Simulation of carbon nanotube FETs with linear doping profile near the source and drain contacts 总被引:1,自引:0,他引:1
Iman Hassaninia Mohammad Hossein Sheikhi Zoheir Kordrostami 《Solid-state electronics》2008,52(6):980-985
We propose carbon nanotube field effect transistors (CNTFETs) in which the source and drain regions of the channel (carbon nanotube) have been doped nonuniformly. The MOSFET like CNTFETs (MOSCNTs) suffer from band to band tunneling which in turn causes the ambipolar conduction. In this paper, we propose a linear doping profile for the carbon nanotube (CNT) near the source and drain contacts. This reduces the gradient of each potential barrier at the interface between the intrinsic and doped parts of the CNT and suppresses the band to band tunneling and ambipolar conduction. The device has been simulated by solving coupled Poisson and Schrödinger equations. Non-equilibrium Green’s function (NEGF) method has been used to investigate the transport properties. The uncoupled mode space approach has been used to reduce the computational burden. The calculated energy band diagrams justified improved ambipolar behavior and lower off current. 相似文献
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The electronic structure of the heterojunction is the foundation of the study on its working mechanism. Models of the heterojunctions formed by an (8, 0) boron nitride nanotube and an (8, 0) carbon nanotube with C-B or C-N interface have been established. The structures of the above heterojunctions were optimized with first-principle calculations based on density functional theory. The rearrangements of the heterojunctions concentrate mainly on their interfaces. The highest occupied molecular orbital and the lowest unoccupied molecular orbital of the heterojunctions distribute in the carbon nanotube section. As the band offsets of the above heterojunctions are achieved with the average bond energy method, the band structure is plotted. 相似文献
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A carbon nanotube-based(CNT) sensing element is presented, which consists of substrate, insulating layer, electrodes, carbon nanotube and measuring circuit. The sensing components are a single or array of CNTs, which are located on the two electrodes. The CNT-based sensing element is fabricated by CVD (chemical vapor deposition)-direct-growth on micro- electrodes. The sensing model and measurement method of electromechanical property are also presented. Finally, the voltage-current characteristics are measured, which show that the CNT-based sensing element has good electrical properties. 相似文献
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