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在材料组成、烧结工艺不变的情况下,系统研究了还原气氛对Y5V、Y5u、Y5P型表面层半导体陶瓷电容器瓷片半导化电阻率、瓷片介电性能的影响。研究结果表明,半导体陶瓷电容器的容量变化率强烈依赖其还原气氛,无论是Y5V、Y5u还是Y5P瓷片均有类似的变化规律。氧分压降低,电容器的电容量温度变化率△C/C变小,当H2:N2比例大于20:100时,瓷片的△C/C不再变化,大约为空气烧结瓷片△C/C的88%。在不改变瓷料组成、烧结温度的情况下,通过还原气氛的适当控制,可改善Y5V、Y5u、Y5P型表面层半导体陶瓷电容器的电容温度特性,而其他介电性能基本不变。 相似文献
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在(Ba_(1-x)Nd_(2x/3)□_(x/3))TiO_3系固溶体中(其中Nd也可以是Pr、Dy、Sm、Gd中的一种)添加Mn的氧化物,可制得表面层半导体陶瓷。该陶瓷经适当选择组成,并在合理的条件下加以处理,可制得单位面积容量为0.1~0.27μF/cm~2,击穿电压达500V左右的半导体陶瓷电容器。 相似文献
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采用一次性烧成技术研制了晶界层半导体陶瓷电容器,在瓷料配制过程中先后加入施主杂质和含有受主杂质的晶界助烧剂,两者在还原烧成时促使晶粒生长并半导化,助烧剂在氧化时有利于晶界绝缘层形成。在一台联体烧成设备中,采用大梯度温度和气氛变化,连续完成还原烧成和氧化处理。还原烧成时,升温速度大于400℃/h。在还原烧成温度下保温后,立即在几分钟内,从还原气氛转到氧化气氛,同时降温300℃以上。整个烧成过程中,瓷体全部是堆烧(叠烧10~20层),生产效率比二次烧成提高10倍以上。 相似文献
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X射线能谱(EDX)分析是目前使用最广泛的表面及亚表面微区化学成分的分析方法之一。 相似文献
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半导体陶瓷电容器的瓷坯为小圆片。瓷片经过烧结、还原半导化和再氧化后 ,表面形成很薄的氧化介质层 ,中间是n型半导体 ,电阻很小 ,起连接导通作用。瓷片两表面印制电极后 ,等效于一对串联电容器。由于氧化介质层很薄 ,且为高介电材料 ,所以能够获得很大的电容量。其结构示意图如图 1。半导体部分和氧化介质层部分虽然材料是一致的 ,但由于晶格结构缺陷 (氧缺位 ) ,而使半导体和氧化介质层SEM二次电子成像中表现出明显不同的衬度 ,通过衬度对比 ,我们测出氧化介质层厚度 ,并且观察判断氧化程度及其一致性 ,它们与工艺、性能密切相关 ,给… 相似文献
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陶瓷压敏电容器是一种在一定电压范围内,电容量随电压呈非线性变化的电容器,其基本特性是电荷量饱和特性。利用此特性,将这种元件与电感串联使用,可以做成高压脉冲发生器,用来点燃日光灯等气体放电灯或可燃性气体。这种电容器的介质是钛酸钡系陶瓷,生产工艺与普通陶瓷电容器基本相同。 相似文献
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A novel oxide charge generation layer (CGL) with optical and electrical advantages for tandem organic light-emitting diodes (OLEDs) is proposed. The CGL comprises amorphous Zn-Si-O (a-ZSO) and MoO3-x. Although a-ZSO has a very small work function of 3.4 eV, it forms Ohmic contact with MoO3-x with a high work function of 6.6 eV. It is discovered that the interface state appears between a-ZSO and MoO3-x, which contributes to the formation of quasi-Ohmic contact between the two oxides with dramatically different work functions. High performance of electron and hole injection/transport is achieved in tandem OLEDs with a very small voltage drop of 0.4 V at 100 mA/cm2 with a twofold increase in current efficiency. This new CGL provides distinct advantages over conventional organic CGL materials with respect to processing simplicity, cost, and chemical stability. 相似文献
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P. D. Ye G. D. Wilk B. Yang J. Kwo H. -J. L. Gossmann M. Frei J. P. Mannaerts M. Sergent M. Hong K. K. Ng J. Bude 《Journal of Electronic Materials》2004,33(8):912-915
We demonstrate GaAs-based, metal-oxide-semiconductor field-effect transistors (MOSFETs) with excellent performance using an
Al2O3 gate dielectric, deposited by atomic layer deposition (ALD). This achievement is very significant because Al2O3 possesses highly desirable physical and electrical properties as a gate dielectric. These MOSFET devices exhibit extremely
low gate-leakage current, high transconductance, and high dielectric breakdown strength. A short-circuit, current-gain, cutoff
frequency (fT) of 14 GHz and a maximum oscillation frequency (fmax) of 25.2 GHz have been achieved from a 0.65-μm gate-length device. The interface trap density (Dit) of Al2O3/GaAs is evaluated by the hysteresis of drain-source current, Ids, versus gate-source bias, Vgs, and the frequency dispersion of transconductance, gm. 相似文献
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an 1 × 10-12 A/cm2.No early failures under stress conditions are found in its TDDB test.The novel MIS capacitor is proven to have excellent reliability for advanced DRAM technology. 相似文献
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A metal-insulator-silicon (MIS) capacitor with hemi-spherical grained poly atomic layer deposition (ALD) deposited Al2O3 and multi-layered chemical vapor deposition (CVD) TiN structure is fabricated. The impact of the deposition process and post treatment condition on the MIS capacitor's time-dependent dielectric breakdown (TDDB) performance is also studied. With an optimized process, it is confirmed by Auger electron spectroscopy and secondary ion mass spectrometry analysis that the Al(CH3)3/O3-based ALD Al2O3 dielectric film is carbon free and the hydrogen content is as low as 9 × 1019 cm-3. The top electrode TiN is obtained by multi-layered TiCl4/NH3 CVD deposited TiN followed by 120 s post NH3 treatment after each layer. This has higher diffusion barrier in preventing impurity diffusion through TiN into the Al2O3 dielectric due to its smaller grain size. As shown in energy dispersive X-ray analysis, there is no chlorine residue in the MIS capacitor structure. The leakage current of the capacitor is lower than 1 × 10-12 A/cm2. No early failures under stress conditions are found in its TDDB test. The novel MIS capacitor is proven to have excellent reliability for advanced DRAM technology. 相似文献