排序方式: 共有61条查询结果,搜索用时 15 毫秒
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研究了静电感应晶体管(SIT)在大注入情况下出现的空间电荷效应,分析了空间电荷效应的物理机制.从理论上推导出了SIT工作在沟道势垒调制下的I-V特性的解析表达式,实验结果表明它们符合得较好.在漏压增长过程中,有两种势垒出现(沟道势垒和空间电荷势垒),它们分别对应于沟道势垒调制和空间电荷势垒调制模式.随漏压增加,SIT逐渐从沟道势垒调制模式转向空间电荷势垒调制模式,对此转变物理过程给出合理解释,直观地给出了SIT在空间电荷效应作用下的变化规律.由于SIT小电流区域的沟道势垒调制使SIT区别于其他器件,其中栅压对SIT空间电荷效应有非常重要的作用. 相似文献
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水杨酸在羟基自由基检测中的应用 总被引:1,自引:0,他引:1
对近二十年来国内外有关水杨酸为捕捉剂的羟基自由基的测定方法,包括高效液相色谱法及其联用法、比色法、气相色谱法、气相色谱-质谱法、液相色谱-质谱法等进行了综述,引用文献25篇。 相似文献
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The electrical contact properties of Co/4H-SiC structures are investigated.A carbon interfacial layer between a Co film and SiC is used to improve the Ohmic contact properties significantly.The C film is deposited prior to Co film deposition on SiC using DC sputtering.The high quality Ohmic contact and specific contact resistivity of 2.30×10-6Ω·cm2 are obtained for Co/C/SiC structures after two-step annealing at 500℃for 10 min and 1050℃for 3 min.The physical properties of the contacts are examined by using XRD.The results indicate that the Co-based metal contacts have better structural stability of silicide phases formed after the high temperature annealing and carbon-enriched layer is produced below the contact,playing a key role in forming an Ohmic contact through the reduction of effective Schottky barrier height for the transport of electrons.The thermal stability of Au/Co/C/SiC Ohmic contacts is investigated.The contacts remain Ohmic on doped n-type(2.8×1018 cm-3) 4H-SiC after thermal aging treatment at 500℃for 20 h. 相似文献
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