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为了实现与现有集成电路工艺兼容的全硅基发光器件,提出了一种新型硅基垂直腔面光发射器件结构。它采用等离子体增强化学气相淀积(PECVD)方法制备的非晶硅(或非晶氮化硅)/二氧化硅交替生长的多层薄膜结构为分布式Bragg反射器(DBR),以夹在上下两个Bragg反射器之间的非晶碳化硅薄膜为中间发光层。通过设计与模拟,分析了DBR中薄膜生长顺序与层数对器件性能的影响。最后研制出光致红光发射器件和电致蓝绿光发射器件,并给出了它们的光致和电致发光谱。结果显示了在光致和电致激发下非晶碳化硅的发光和DBR对光谱的限制增强作用。 相似文献
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Demonstration of Four Fundamental Operations of Liquid Droplets for Digital Microfluidic Systems Based on an Electrowetting-on-Dielectric Actuator 下载免费PDF全文
An electrowetting-on-dielectric actuator is developed, in which the liquid is sandwiched between top and bottom plates. For the bottom plate, silicon wafer is used as the substrate, the heavily phosphorus-doped polysilicon film is deposited by low pressure chemical vapour deposition as the microelectrode array, and thermally grown SiO2 film as the dielectric layer. The top p/ate is a glass plate covered with transparent and conductive indium tin oxide as the ground electrode. In addition, a Teflon AF1600 film is spun on the surface of both the plates as the hydrophobic layer. The experimental results show that when the gap height between two plates is 133μm, a prototype of the device is capable of creating, transporting, merging and dividing droplets of deionized water in an air environment with a 70V at lOHz voltage pulse. This is also established by simulations using the computational fluidic software of CFD-ACE+. 相似文献
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硅基PZT薄膜的制备与工艺损伤 总被引:1,自引:0,他引:1
以 Pb Ti O3(PT)作为种子层 ,在 Si衬底上用改进的溶胶凝胶法制备了 PZT薄膜 ,并用 RIE法刻蚀形成 MFM(金属铁电层金属 )结构的电容 ,以用于铁电随机存取存储器 (Fe RAM)中。测得 PZT薄膜相对介电常数、矫顽场和剩余极化强度分别为 10 0 0 ,30 k V/ cm和 16 μC/ cm2 ,漏电流在 0 .1n A / cm2 量级 ,达到 Fe RAM的应用要求。铁电膜与CMOS电路集成时对铁电膜的铁电性可能造成的工艺损伤(如刻蚀损伤、氢损伤和应力损伤等 )的物理机制进行了初步研究和讨论 ,并提出了一些初步的解决途径 相似文献
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Analytical solutions are presented for the wave equation for the electrode-piezoelectric-electrode sandwich structure in film bulk acoustic resonators (FBAR). The impedance for lead-zirconate-titanate (PZT)-based FBAR was derived using the proper boundary conditions and material parameters. A method is presented to adjust the resonant frequency based on the process and material properties. Ferroelectric-based radio-frequency filters were designed using FBARs. An accurate result is given for the filter impedance which can be used for other piezoelectric devices. 相似文献
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汽车轮胎压力监测系统(TPMS)的主要技术难点是无线通信的可靠性和稳定性,以及如何延长发射端工作电池的使用寿命。针对这些技术难点,该文对低功耗发射器电路和接收器电路进行了研究和设计。对TPMS发射和接收天线辐射电阻、损耗电阻和电感等参数进行了分析,并根据这些参数设计出匹配网络,提高低功耗电路的发射效率。分析了因车轮高速运动引起的多径衰落和Doppler频移对接收信号和性能的影响,以及如何通过改变软件的编码格式和通讯协议来克服,从而研制出一种全新有效而且稳定可靠的TPMS通讯系统与天线。其整体性能在静态﹑动态和实际装车运行测试中达到了很好的效果,超过了TPMS相关国际标准的要求。 相似文献
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A handwriting input system was developed using three collinear ultrasonic transducers. These collinear polyvinylidene fluoride (PVDF) transducers were specially designed for the handwriting input system to give a large writeable area with writing in any direction. Driver and detection circuits were developed for the handwriting system. This handwriting input system based on 2-dimensional position tracing has large writeable area (A4 paper), low drive voltage (5 V), and is independent of the handwriting pad or the pen. 相似文献
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微型泵在化学分析、环境监测和药物传送等领域有广阔应用前景。为了解热驱动薄膜式微型泵的性能 ,对泵的主要部件进行了理论分析 ,然后对泵的整体性能进行了数值模拟。得到了微型泵的频率特性 ,流量 -压头曲线及流量随功率的变化。发现泵的流量在 3 .3 3 Hz左右达到最大 ,泵的零流量压头为 64 k Pa左右 ;由于预应力的作用 ,使输入功率低时泵的流量比没有预应力时显著减小 ,而当输入功率较大时 ,泵的流量随输入功率增大而迅速增大。实验测定了微型泵流量的频率特性和随功率的变化 ,实测结果与模拟结果基本吻合 相似文献
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The most common typical bulk acoustic wave (BAW) filters are fabricated using bulk micromachining technology, but they have several disadvantages. This paper describes a new structure for front end passband BAW filters manufactured using surface micromachining. Porous silicon is used as a thick sacrificial layer. The structure reduces the influence of the support film on the filter to improve the VLSI compatibility as well as the filter quality. The cross-talk between resonators with different frequencies can be dramatically reduced by using resonators with a self-supporting structure. 相似文献
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