SiOx调制的三元硅化物(C01-xNix)Si2外延

报道了通过Co/Ni/SiOx/Si(100)体系固相反应,实现三元硅化物(Co1xNix)Si2薄膜外延生长及薄膜特性的表征.测试结果表明,中间氧化硅层对原子扩散起到阻挡作用.XRD和RBS图谱显示,有中间层的样品所形成的硅化物膜和硅衬底有良好的外延关系.而Co/Ni/Si(100)体系,则形成多晶硅化物膜,和硅衬底没有外延关系.外延三元硅化物(Co1-xNix)Si2膜的晶格常数介于CoSi2和NiSi2之间,从而可以降低生成膜的应力.薄膜的厚度约为110nm;最小沟道产额(Xmin)为22%.外延三元硅化物膜的电阻率约为17μΩ@cm;高温稳定性达1000C,与CoSi2膜相当.     

Co/C/Si(100)结构固相外延生长CoSi_2

采用 Co/C/Si多层薄膜结构的中间层诱导固相外延方法在 Si(10 0 )上制备外延 Co Si2 薄膜 .用四探针电阻仪、XRD、AES、RBS等分析手段对该结构固相反应形成的薄膜的电学特性、组分、晶体结构等进行了表征 .结果表明 ,Co/C/Si多层结构经快速热退火 ,可以在 Si(10 0 )衬底上得到导电性能和高温稳定性良好的 Co Si2 薄膜 .C层的加入阻碍了 Co和 Si的互扩散和互反应 ,从而促进了 Co Si2 在硅衬底上的外延 .     

Co/C/Si(100)结构固相外延生长CoSi2

采用Co/C/Si多层薄膜结构的中间层诱导固相外延方法在Si(100)上制备外延CoSi2薄膜.用四探针电阻仪、XRD、AES、RBS等分析手段对该结构固相反应形成的薄膜的电学特性、组分、晶体结构等进行了表征.结果表明,Co/C/Si多层结构经快速热退火,可以在Si(100)衬底上得到导电性能和高温稳定性良好的CoSi2薄膜.C层的加入阻碍了Co和Si的互扩散和互反应,从而促进了CoSi2在硅衬底上的外延.     

用于自对准提升硅化物结构的CO/Si/Ti/Si及CO/Si/…Ti/Si多层薄膜固相反应研究

为了减小硅化物形成过程中消耗的衬底硅,提出添加非晶Si的新方法,并探索了Co/Si/Ti/Si及Co/Si(×7)/Ti/Si多层薄膜固相反应的两种途径.实验采用四探针、XRD、RBS等多种方法对固相反应过程进行了研究,对反应形成的CoSi2薄膜进行了测试分析,并探索了在SiO2/Si及图形片上的选择腐蚀工艺.结果表明,当选择合适的Co：Si原子比,恰当的两步退火方式及选择腐蚀溶液,两种方法都可以形成自对准硅化物结构.研究了这两种固相反应过程,发现在一定的Co:Si原子比范围内,这两种方法制备的CoSi2薄膜都有一定的外延特性,其中第一种途径得到的CoSi2薄膜具有十分良好的外延特性.     

固相反应制备的多晶和外延 CoSi_2/n-Si(111)接触的肖特基特性(英文)

通过硅 (111)衬底淀积的单层 Co或 Co/ Ti双金属层在不同退火温度的固相反应 ,在硅上形成制备了多晶和外延 Co Si2 薄膜 .用电流 -电压和电容 -电压 (I- V/ C- V)技术在 90 K到室温的温度范围内测量了 Co Si2 / Si肖特基接触特性。用肖特基势垒不均匀模型分析了所测得的 I- V特性 ,在较高温度下 (≥～ 2 0 0 K)或较低温度的较大偏压区域 ,I- V曲线能用热激发和在整个结面积上势垒高度的高斯分布模型描述 .而在较低温度的较小偏压区域 ,电流由流过一些小势垒高度微区的电流决定 ,从而在低温 I- V曲线上在约 10 - 7A处有一个“曲折”.在室温下 ,从 I-V曲线得到的多晶 Co Si2 / Si的势垒高度为约 0 .5 7e V.对外延 Co Si2 ,势垒高度依赖于最后退火温度 ,当退火温度从 70 0℃升到 90 0℃ ,势垒高度从 0 .5 4e V升高到 0 .6 0 e V.     

Pt层对Ni/Si(100)固相反应NiSi薄膜高温稳定性的增强效应

研究了顺次淀积在 Si (10 0 )衬底上的 Ni/ Pt和 Pt/ Ni的固相硅化反应 .研究发现 ,当 1nm Pt作为中间层或覆盖层加入 Ni/ Si体系中时 ,延缓了 Ni Si向 Ni Si2 的转变 ,相变温度提高 .对于这种双层薄膜体系 ,80 0℃退火后 ,XRD测试未检测到 Ni Si2 相存在 ;85 0℃退火后的薄膜仍有一些 Ni Si衍射峰存在 . 80 0℃退火后的薄膜呈现较低的电阻率 ,在 2 3— 2 5 μΩ· cm范围 .上述薄膜较 Ni/ Si直接反应生成膜的热稳定性提高了 10 0℃以上 .这有利于Ni Si薄膜材料在 Si基器件制造中的应用 .     

Co/a-GeSi/Ti/Si多层薄膜固相反应外延生长CoSi_2薄膜

研究了在 Co/Ti/Si结构中加入非晶 Ge Si层对 Co Si2 /Si异质固相外延的影响 ,用离子束溅射方法在Si衬底上制备 Co/Ge Si/Ti/Si结构多层薄膜 ,通过快速热退火使多层薄膜发生固相反应。采用四探针电阻仪、AES、XRD、RBS等方法进行测试。实验表明 ,利用 Co/Ge Si/Ti/Si固相反应形成的 Co Si2 薄膜具有良好的外延特性和电学特性 ,Ti中间层和非晶 Ge Si中间层具有促进和改善 Co Si2 外延质量 ,减少衬底耗硅量的作用。Ge原子的存在能够改善外延 Co Si2 薄膜的晶格失配率     

固相反应制备的多晶和外延CoSi_2/n-Si(111)接触的肖特基特性

通过硅 (111)衬底淀积的单层 Co或 Co/ Ti双金属层在不同退火温度的固相反应 ,在硅上形成制备了多晶和外延 Co Si2 薄膜 .用电流 -电压和电容 -电压 (I- V/ C- V)技术在 90 K到室温的温度范围内测量了 Co Si2 / Si肖特基接触特性。用肖特基势垒不均匀模型分析了所测得的 I- V特性 ,在较高温度下 (≥～ 2 0 0 K)或较低温度的较大偏压区域 ,I- V曲线能用热激发和在整个结面积上势垒高度的高斯分布模型描述 .而在较低温度的较小偏压区域 ,电流由流过一些小势垒高度微区的电流决定 ,从而在低温 I- V曲线上在约 10 - 7A处有一个“曲折”.     

难熔夹层金属提高NiSi薄膜热稳定性的新思路

首次给出了一种具有规律性的能用来提高镍硅化物热稳定性的方法.依据此方法,摸索出在Ni中分别以夹层金属掺入Pt、Mo、Zr、W金属来提高NiSi硅化物的热稳定性.概括总结了掺人难熔金属M后形成的三元镍硅化物Ni(M)Si热稳定性能.实验结果表明,Ni(M)Si硅化物薄膜四种镍硅化物薄膜有相同的热稳定性.以Ni/W/Ni/...     

Si衬底上采用溅射Fe/Si纳米多层结构制备β-FeSi2薄膜

采用磁控溅射的方法在Si衬底上生长Fe/Si多层膜,退火后形成了硅化物薄膜。利用X射线衍射(XRD)、Raman光谱、原子力显微镜(AFM)研究了Fe/Si膜厚比和退火温度对薄膜结构特性的影响。研究表明,当Fe/Si膜厚比为1/2,预先在衬底上沉积Fe缓冲层,退火温度为750℃,形成的硅化物为β-FeSi2,晶粒的平均尺寸大约为50nm,且分布得比较均匀。如果Fe/Si厚度比为1/1或3/10时,形成的硅化物为ε-FeSi。随着退火温度的升高,Fe/Si之间的相互扩散逐渐增强,当退火温度为1 000℃时,形成了富硅的二硅化物的高温相α-FeSi2。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.