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Analysis and simulation of a 4H-SiC semi-superjunction Schottky barrier diode for softer reverse-recovery
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In this paper, a 4H-SiC semi-superjunction (SJ) Schottky barrier diode is analysed and simulated. The semi-SJ structure has an optimized design and a specific on-resistance lower than that of conventional SJ structures, which can be achieved without increasing the process difficulty. The simulation results show that the specific on-resistance and the softness factor depend on the aspect and thickness ratios, and that by using the semi-SJ structure, specific on-resistance can be reduced without decreasing the softness factor. It is observed that a trade-off exists between the specific on-resistance and the softness of the diode. 相似文献
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In this paper, we propose the near-infrared p-type β-FeSi2/n-type 4H-SiC heterojunction photodetector with semiconducting silicide (β-FeSi2) as the active region for the first time. Optoelectronic characteristics of the photodetector are simulated using a commercial simulator at room temperature. The results show that the photodetector has a good rectifying character and a good response to the near-infrared light. Interface states should be minimized to obtain a lower reverse leakage current. The response spectrum of the β-FeSi2/4H-SiC detector, which consists of a p-type β-FeSi2 absorption layer with a doping concentration of 1×1015 cm-3 and a thickness of 2.5 μm, has a peak of 755 mA/W at 1.42 μm. The illumination of the SiC side obtains a higher responsivity than that of the β-FeSi2 side. The results illustrate that the β-FeSi2/4H-SiC heterojunction can be used as a near-infrared photodetector compatible with near-infrared optically-activated SiC-based power switching devices. 相似文献
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利用水平热壁CVD方法,基于SiH4-C3 H8-H2生长系统在n型4H-SiC偏4°衬底上进行同质外延生长.通过Nomarski光学显微镜、激光共聚焦显微镜和拉曼散射光谱(Raman),对外延层中的新形貌三角形缺陷——顶端有倒金字塔结构的三角形缺陷(IPRTD)的表面形貌、结构进行了表征,并根据表征结果提出了该新形貌三角形缺陷的产生机理.研究结果表明,IPRTD由3C-SiC晶型构成;在外延生长中,位于IPRTD生长方向上游的位错缺陷所引起的表面吸附原子的2D成核生长是导致3C-SiC晶型出现的主要原因.同时,外延生长过程中,生长速率和氢气刻蚀作用在[1120]和[1100]/[1100]方向上的差异是导致IPRTD顶端具有倒金字塔结构的主要原因. 相似文献
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离子液体超酸清洁催化苯的烷基化反应 总被引:3,自引:0,他引:3
研究了在具有Lewis酸性的离子液体体系中进行的苯与烯烃及卤代烃的烷基化反应.以氯化1-甲基-3-乙基咪唑(MEIC)、氯化1-丁基吡啶(BPC)、氯化l-甲基-3-丁基咪唑(MBIC)及盐酸三甲胺(TMHC)季铵盐分别与AlCl3原位合成法制备离子液体催化体系.结果表明:以上各种离子液体均有很高的催化活性,反应转化率在较短的时间内达到100%.其中TMHC-A1Cl3离子液体单烷基化选择性达98.6%.与AlCl3相比,催化活性显著提高,生成烷基化产物不溶于离子液体,因而易于分离,催化剂可重复使用. 相似文献
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为贯彻落实新课程改革理念,笔者在教学《统计初步》时,尽力体现“发展统计观念”,改进教学方法,培养学生深入生活实践,多渠道收集信息,整理、描述、分析数据,从统计的角度思考与数据信息有关的问题,并进行合理决策、合理预测和合理质疑.一、让学生参与调查和统计过程,从统计角度思考有关问题统计实习时,学生按自然村分组.第一组“新北村”的学生,到镇农资商店了解情况,在销售人员的指导下,选定了产地不同的化肥尿素A、B、C进行调查.他们共向所在村农户发放了270份问卷(问卷由单选和多选题组成),对回收的238份问卷整理后,在教师的指导下得… 相似文献