Rt／Si 快速热退火固相反应制备超薄PtSi薄膜

对Ｐｔ／Ｓｉ快速热退火固相反庆形成超薄ＰｔＳｉ薄膜进行研究。溅射Ｐｔ薄膜的厚度在５－－２０ｍｍ之间，用ＡＥＳ，ＸＲＤ，ＲＢＳ，ＳＥＭ等分析测试手段对固相反应ＰｔＳｉ薄膜的结构特性进行观测，并对ＰｔＳｉ／ｎ－Ｓｉ肖特基结电学性能进行了测试。实验结果表明，５５０－－６００快速退火有利于Ｐｔ／Ｓｉ反应形成性能优良的ＰｔＳｉ／Ｓｉ肖特基热垒接触。     

Co、Ti／Si_（1－x）Ge_x薄膜快速退火固相反应结构和组分研究

本文首次研究金属Ｃｏ与分子束外延Ｓｉ１－ｘＧｅｘ单晶薄膜快速热退火（ＲＴＡ）固相反应，并对比了ＣＯ、Ｔｉ与ＳｉＧｅ固相反应时不同的反应规律实验采用ＲＢＳ、ＡＥＳ、ＸＲＤ、ＳＥＭ等分析和测试手段对样品的组分和结构等薄膜特性进行检测．实验发现，Ｃｏ／Ｓｉ０．８Ｇｅ０，２在６５０℃热退火后形成组分为Ｃｏ（Ｓｉ０，９Ｇｅ０．１）的立方晶系结构，薄膜具有强烈择优取向；９００℃处理温度，有ＣｏＳｉ２形成，同时Ｇｅ明显地向表面分凝．ＴｉＮ／Ｔｉ／Ｓｉ０．８Ｇｅ０．２固相反应时，８５０℃处理可以形成Ｔｉ（Ｓｉ１－ｙＧｅｙ     

自对准外延CoSi_2源漏接触CMOS器件技术

ＣＯ／Ｔｉ／Ｓｉ或ＴｉＮ／Ｃｏ／Ｔｉ／Ｓｉ多层薄膜结构通过多步退火技术在Ｓｉ单晶衬底上外延生长ＣｏＳｉ２薄膜，ＡＥＳ、ＲＢＳ测试显示ＣｏＳｉ２薄膜具有良好均匀性和单晶性．这种硅化物新技术已用于ＣＭＯＳ器件工艺．采用等离子体增强化学汽相淀积（ＰＥＣＶＤ）技术淀积氮氧化硅薄膜，并用反应离子刻蚀（ＲＩＥ）技术形成多晶硅栅边墙．固相外延ＣｏＳｉ２薄膜技术和边墙工艺相结合，经过选择腐蚀，可以分别在源漏区和栅区形成单晶ＣｏＳｉ２和多晶ＣｏＳｉ２薄膜，构成新型自对准硅化物（ＳＡＬＩＣＩＤＥ）器件结构．在Ｎ阱ＣＭＯＳ工艺     

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     

PtSi／Si整流接触的研究

本文对是ＰｔＳｉ／Ｓｉ整流特性的接触进行了详细研究，并试制成功ＰｔＳｉ／ｐ－Ｓｉ和ＰｔＳｉ／ｎ－Ｓｉ两种用途不同的肖特基势垒二极管。     

三元硅化物(Co_xNi_(l-x))Si_2薄膜的制备及特性

在Ｓｉ（１００）衬底上用离子束溅射方法淀积Ｎｉ,Ｃｏ,Ｔｉ薄膜,形成Ｃｏ／Ｎｉ／Ｓｉ,Ｎｉ／Ｃｏ／Ｓｉ和Ｃｏ／Ｎｉ／Ｓｉ等结构,通过氮气中快速热退火反应生成三元硅化物（ＣｏｘＮｉｌ－ｘ）Ｓｉ２。用ＡＥＳ,ＸＲＤ,ＲＢＳ沟道谱,ＳＥＭ及四探针等方法对（ＣｏｘＮｉｌ－ｘ）Ｓｉ２薄膜的物理特性和电学特性进行了测试,在Ｓｉ衬底上Ｃｏ,Ｎｉ多层膜经快速热退火可形成高电导的（ＣｏｘＮｉｌ－ｘ）Ｓｉ２薄膜,其电阻率在１５～２０μΩ·ｃｍ之间。Ｃｏ／Ｎｉ／Ｔｉ／Ｓｉ（１００）多层结构固相反应可以得到外延（ＣｏｘＮｉｌ－ｘ）Ｓｉ２薄膜。（ＣｏｘＮｉｌ－ｘ）Ｓｉ２的晶格为ＣａＦ２立方结构,晶格常数介于ＣｏＳｉ２和ＮｉＳｉ２之间。通过热处理和选择腐蚀等工艺,可在有ＣＭＯＳ图形的衬底上形成自对准的三元硅化物源漏接触和栅极互连图形。     

TiN覆盖层和Co/Ti/Si三元固相反应改善超薄CoSi_2高温稳定性

本文研究不同金属薄膜结构形成的超薄ＣｏＳｉ２膜的高温稳定性．采用离子束溅射和反应磁控溅射技术制备Ｃｏ／Ｓｉ、ＴｉＮ／Ｃｏ／Ｓｉ、Ｃｏ／Ｔｉ／Ｓｉ、ＴｉＮ／Ｃｏ／Ｔｉ／Ｓｉ不同结构，在高纯氮气下进行快速热退火（ＲＴＡ），形成ＣｏＳｉ２薄膜．应用四探针薄层电阻测试、扫描电子显微镜（ＳＥＭ）、透射电子显微镜（ＴＥＭ）进行测试．实验结果表明：ＴｉＮ覆盖层和Ｃｏ／Ｔｉ／Ｓｉ三元固相反应都是有利于形成具有良好高温稳定特性的ＣｏＳｉ２薄膜的有效方法，有望应用于深亚微米接触和互连技术中．     

三元硅化物（CoxNi1—x）Si2薄膜的制备及特性

在Ｓｉ（１００）衬底上用离子束溅射方法淀积Ｎｉ,Ｃｏ,Ｔｉ薄膜,形成Ｃｏ／Ｎｉ／Ｓｉ,Ｎｉ／Ｃｏ／Ｓｉ和Ｃｏ／Ｎｉ／Ｓｉ等结构,通过氮气中快速热退火反应生成三元硅化物（ＣｏｘＮｉ１－ｘ）Ｓｉ２。用ＡＥＳ,ＸＲＤ,ＲＢＳ沟道谱,ＳＥＭ及四探针等方法（ＣｏｘＮｉ１－ｘ）Ｓｉ２薄膜的物理特性和电学特性进行了测试,在Ｓｉ衬底上Ｃｏ,Ｎｉ多层膜经快速热退火可形成高电导的（ＣｏｘＮｉ１－ｘ）Ｓｉ２薄膜,其电阻     

Pt／Si界面反应与肖特基势垒形成的研究

利用俄歇电子能谱，二次离子质谱，深能级瞬态谱（ＤＬＴＳ）和Ｃ－Ｖ法等测量方法，详细研究了Ｐｔ／Ｓｉ和Ｐｔ硅化物／Ｓｉ界面的反应性质，原子结构及杂质／缺陷的分布，讨论了它们对肖特基势垒的形成，势垒特发生和势垒高度的影响。     

硅化物形成条的条件对Pt硅化物／硅势垒的影响

利用俄歇电子能谱，深能化瞬态谱，及Ｉ－Ｖ和Ｃ－Ｖ两种电学测量方法对ＰｔＳｉ－Ｎ－Ｓｉ和ＰｔＳｉ／Ｐ－Ｓｉ两种肖特基势垒的形成条件与势垒度之间的关系进行了详细研究。从理论上分析了在退火过程中引入的影响肖特基势垒特性的各种因素，同时指出了获得理想肖特基势垒的退火条件。     

X射线衍射、X射线光电子能谱对PtSi薄膜形成机理的研究

促使物相尽可能地向Pt2Si和PtSi 转化,是PtSi薄膜工艺研究中的重要工作。文中通过用X射线衍射（ XRD）、X射线光电子能谱（XPS）微观分析手段对PtSi薄膜形成物相分步观察,研究了长时间变温退火、真空退火以及真空和保护气体（N2和H2）退火等工艺条件对溅射PtSi薄膜物相形成的影响。结果表明,氢气气氛退火能提高薄膜质量;真空退火可以减少氧元素对成膜的影响。     

PtSi薄膜超薄化及连续性研究

减薄膜厚有利于提高ＰｔＳｉ红外探测器的量子效率。本文研究了膜厚减薄工艺对薄膜连续性的影响。用ＸＲＤ观察物相,ＳＥＭ、ＴＥＭ研究薄膜连续性,并给出理论解释,实验表明用混合生长（Ｓ－Ｋ）模式能形成超薄连续薄膜。     

用弹道电子发射显微术研究超薄金属硅化物/硅肖特基接触

采用弹道电子发射显微术 ( BEEM)技术对超薄 Pt Si/Si、Co Si2 /Si肖特基接触特性进行了研究 ,并与电流 -电压 ( I- V)及电容 -电压 ( C- V)测试结果进行了对比 .研究了 Ar离子轰击对超薄Pt Si/n- Si肖特基接触特性的影响 .BEEM、I- V/C- V技术对多种样品的研究结果表明 ,I- V/C- V测试会由于超薄硅化物层串联电阻的影响而使测试结果产生严重误差 ;BEEM测试则不受影响 .随着离子轰击能量增大 ,肖特基势垒高度降低 ,且其不均匀性也越大 .用 BEEM和变温 I- V对超薄 Co Si2 /n- Si肖特基二极管的研究结果表明 ,变温 I- V测试可在一定程度上获得肖特基势垒     

石墨上多晶硅薄膜的制备及择优取向的调控

利用磁控溅射在石墨衬底上制备了非晶硅薄膜,并使用快速热退火对薄膜进行了晶化处理。XRD分析表明,直接溅射沉积在石墨衬底上的硅薄膜经过快速热退火后具有高度的(220)择优取向。通过在硅薄膜和石墨衬底界面处引入一定厚度的ZnO中间层,晶化后的多晶硅薄膜择优取向实现了从(220)向(400)的转变,从而非常有利于将成熟的制绒工艺应用于该材料体系的电池制备过程中。对于择优取向的转变提出了解释,认为Si(100)面和ZnO(001)面晶格匹配是主要原因。喇曼分析表明ZnO中间层的引入提高了多晶硅薄膜的晶体质量。     

纳米尺度压电薄膜PZT的结构特征和性能

采用改进的溶胶-凝胶(Sol-Gel)方法在Pt/Ti/SiO2/Si基片上制备锆钛酸铅(PZT)纳米晶薄膜,研究了不同的热处理方式对PZT薄膜的晶粒结构、尺寸及电学性能的影响。X-射线衍射(XRD)分析表明:传统的热处理方式更有利于得到具有一定择优取向性的PZT薄膜。原子力显微镜(AFM)显示:快速热处理方式使PZT薄膜的晶粒具有自形晶结构,晶粒的排布更为有序,从而改善了薄膜的致密性。阻抗分析仪的测试结果表明:经快速热处理的薄膜,漏电流大约比传统热处理处理的薄膜的漏电流降低了20倍左右。     

An improvement of hot-carrier reliability in the stackednitride-oxide gate n- and p-MISFET's

Thin LPCVD stacked nitride-oxide gate MISFET's offer the potential for high current drive as a consequence of the high permittivity of the nitride. However, thin nitride-oxide films have yet to be used in actual MISFET's for LSI products because thin nitride films have poor masking ability during re-oxidation and low reliability under hot-carrier stress. We have investigated improvements to thin LPCVD stacked nitride-oxide films as regards masking ability during re-oxidation and hot-carrier reliability. The method proposed to improve film quality is densification through high-temperature rapid thermal processes and its effectiveness has been tested. Simple rapid thermal annealing (RTA) did not improve the film quality at all. On the other hand, rapid thermal nitridation (RTN) on the deposited nitride film improved it considerably. The reason for the improvement by RTN was investigated     

Ti中间层对超薄Ni膜硅化反应特性的影响

在多种Si衬底上利用离子束溅射淀积超薄Ni膜以及Ni/Ti双层膜，经过快速热退火处理完成薄膜的固相硅化反应，通过四探针法、微区喇曼散射法和俄歇深度分布测试法研究了Ti中间层对Ni硅化反应的影响. 实验结果证明Ti中间层抑制了集成电路生产最需要的NiSi相的形成.     

Solid-phase Crystallization of Hydrogenated Amorphous Silicon on Glass Substrates

Amorphous silicon films prepared by PECVD on glass substrate have been crystallized by conventional furnace annealing and rapid thermal annealing（RTA）, respectively. From the Raman spectra, X- ray diffraction and scanning electron microscope, it is found that the grain size is crystallized at 850 ℃ in both techniques. The thin film made by RTA is smooth and of perfect structure, the thin film annealed by FA has a highly structural disorder. An average grain size of about 30 nm is obtained by both techniques.     

Silicide formation and interdiffusion effects in Si-Ta,SiO2-Ta AND Si-PtSi-Ta thin film structures

The formation of TaSi₂ in the Si-PtSi-Ta and Si-Ta systems has been studied using Auger spectroscopy, x-ray diffraction and electron diffraction techniques. The reaction of tantalum with PtSi was observed by Sinha, et al.^l to take place with high temperature (800°-900°c) annealing of thin film systems consisting of Si-PtSi-Ta-W¹. In the present investigation, it is shown that tantalum reacts with PtSi at approximately 600°C to form a mixture of Ta₅Si₃ and TaSi₂ and predominantly TaSi₂ at 785°C. Platinum is displaced at the refractory metal (Ta)-PtSi interface, whereupon the more stable refractory metal-silicide is formed. The displaced platinum reacts further with the excess silicon which diffuses from the Si-PtSi interface. The Si-PtSi-Ta reaction is similar to the Si-PtSi-W reaction. However, unlike tungsten which migrates very little in the Si-PtSi-W system, tantalum appears to interdiffuse with the PtSi at temperatures as low as 600°C. In the case of the Si-Ta couple, TaSi₂ forms at approximately 750°C as determined by transmission electron microscopy (TEM) measurements. The kinetics of TaSi₂ formation at the Si-Ta interface are compared to that which takes place at the PtSi-Ta interface to determine the influence of the PtSi layer. Silicide formation was not observed in SiO₂-Ta specimens. after anneals up to 800°c. At 750°C Ta₂O₅ formed as observed by electron diffraction.     

A wide spectral band photodetector with PtSi/p-Si Schottky-barrier

The photoresponse of a front-illuminated PtSi Schottky-barrier detector is measured in the wavelength range between 0.4 and 5.2μm. In the wavelength range longer than 1.1μm, the detection mechanism is the internal photoemission. On the other hand, the intrinsic mechanism becomes dominant in the wavelength range shorter than 1.1μm. The measured data are in good agreement with values calculated from these two detection mechanisms. The photoresponse depends on the PtSi thickness in both wavelength ranges. For getting a high responsivity, it is important to make a thin uniform metal film. The visible and the thermal image with a PtSi Schottky-barrier wide spectral band imager are also demonstrated.