用于VLSI的PECVD硼磷硅玻璃膜的制备工艺和特性分析

硼磷硅玻璃膜(BPSG)是在等离子增强型化学汽相淀积(PECVD)系统中淀积的。在一个可容纳70个园片(片径100毫米)的淀积区内,膜厚度均匀性好于±5％、膜中掺杂量的变化低于±0.5％(重量)。具有保形台阶覆盖的淀积速率是200～300埃/分。本文概述了一种用离子色谱法来对掺杂物分析的新技术,也是作为用更通用的仪器进行快速无损分析的一种技术。最后,在本文中还表示了在各种掺杂浓度下低回流处理温度和回流角之函数关系。     

InSbCID焦平面器件中介质膜的制备和应用

本文介绍了等离子增强化学汽相淀积(简称PECVD)二氧化硅的生长原理.用硅烷(SiH_4)和二氧化碳(CO_2)通过射频电场产生辉光放电等离子体,以此增强化学反应降低淀积温度.在60～300℃下,SiH_4流量为0.5～2.0升/分,CO_2流量为0.2～1.5升/分,淀积压力为0.8～3.5托,射频功率为20～50瓦,极板间距为12～20.5毫米的条件下淀积二氧化硅膜.给出了射频功率、淀积压力、气体流量比等对淀积速率的影响以及红外光谱分析结果.其次,简述了PECVD二氧化硅钝化膜的性能及其在全单片锑化铟红外电荷注入器件(FMInSbIRCID)研制中的应用情况.     

二氧化硅膜的减压淀积

我们在一个减压CVD反应器中,于700～750℃下用四乙氧基硅烷(TEOS)分解法,在硅衬底上淀积出了二氧化硅膜。淀积速率为200～300埃/分。在能装载100片的淀积区,淀积膜厚的均匀性优于1％。台阶覆盖性良好,缺陷密度很低,膜的应力是压应力而且很小。膜的折射率,红外质谱和密度与常压淀积的二氧化硅膜相同。系统中添加磷化物使淀积速率增加,膜厚的均匀性变坏。因此,这种反应并不能适用于淀积集成电路所用的掺磷二氧化硅膜;然而,对非掺杂的二氧化硅膜淀积工艺来说,这种反应似乎是一个很好的工艺过程。     

Ti的激光化学汽相淀积

用1.4kW_cwTEM_ooCO_2激光分解TiBr_4,使Ti淀积在不锈钢基体上。对膜的厚度和淀积速率作为TiBr_4的分蒸气压、辐射时间和室温的函数进行了研究。得到比用化学汽相淀积制作的纯Ti膜大两个数量级的淀积速率(190μm/h)。另外,用俄歇电子谱、扫描电     

封闭系统中Pb_xSn_(1-x)Te外延淀积在Pb_xSn_(1-x)Te基片上

在封闭系统中往Pb_(0.79)Sn_(0.21)Te(100)基片上淀积载流子浓度在10~(17)/厘米~3范围内的P型Pb_(.79)Sn_(0.21)Te外延膜,速率为1.5～3.0微米/小时。这些外延膜是在425～525℃下用符合化学计量或金属略多的料淀积的。淀积的n型膜夹杂着金属。膜的结构受基片缺陷、基片温度及装料组分的影响。制成了厚达100微米的膜。采用肖特基势垒工艺,在外延膜上做出了在77K下黑体探测度为10~(10)厘米赫~(1/2)/瓦的红外探测器阵列。     

Si1-x-y GexCy的淀积工艺和材料特性

研究了利用减压外延的方法制备Si1-x-yGexCy薄膜的特性及与工艺参数之间的关系,给出了改善表面粗糙度、减少有源区关键尺寸(CD)减少量的方法。在单晶硅、图形硅片α-Si和光片α-Si表面Si1-x-yGexCy上淀积的Si1-x-yGexCy薄膜的表面形貌不同,在单晶硅上成长的是单晶态的Si1-x-yGexCy,在除单晶硅之外的材料上成长的都是多晶态的Si1-x-yGexCy,多晶态Si1-x-yGexCy的淀积速率高于单晶态Si1-x-yGexCy的淀积速率。多晶态Si1-x-yGexCy的淀积速率高于单晶态Si1-x-yGexCy的淀积速率,造成了淀积工艺完成后有源区CD的减少。利用低温淀积工艺和控制浅沟槽隔离(STI)凹陷的深度,可以有效减少由于淀积Si1-x-yGexCy薄膜造成的有源区CD减少量。同时,研究了碳组分对硼扩散的抑制作用,碳组分越高,对硼扩散的抑制作用越大。     

PECVD二氧化硅薄膜的工艺分析

本文主要分析等离子增强化学汽相淀积(简称PECVD)二氧化硅的生长机理。用硅烷(SiH_4)和二氧化碳(CO_2)通过射频电场产生辉光放电等离子体,以此增强化学反应降低淀积温度。在常温至300℃下,SiH_4流量为0.5～1.0升/分,CO_2流量为1.5～1.8升/分,淀积压力为0.8～2.0托,射频功率为45～88瓦,极板间距为18～20.5毫米的条件下淀积二氧化硅膜。给出了射频功率、淀积压力、气源流量比等对淀积速率的影响以及红外光谱分析结果。     

高温法淀积PbS多晶膜的化学过程

PbS多晶膜化学淀积过程,直接关系到PbS元件的光电性能,是PbS器件制备的核心工艺。在PbS多晶膜形成的化学过程中,还伴随着其他化学反应发生。因而,除生成PbS多晶膜外,还产生其他一些化合物。如何控制其他化学反应进行的进程和程度是化学淀积PbS多晶膜工艺极为重要的任务之一。一、NaOH、Pb(CH_3COO)_2及(NH_2)_2CS溶解过程NaOH、Pb(CH_3GOO)_2及(NH_2)_2CS是高温法化学淀积PbS多晶膜的三种试剂。这三种化合物在淀积PbS多晶膜前均需溶解于水中。1.NaOH的存放和溶解     

半导体材料

Y98-61460-75 9914816作为红外肖特基探测器的 P 型硅上的硅-锗-硼无定形合金=Silicon-germanium—boron amorphous alloy on p-type Si as infrared chottky detector[会,英]/Gomez,J.G.S.& Jacome.A.T.//1998 IEEE 2nd InternationalCaracas Conference on Devices.Circuits and Systems.——75～78(YG)本文提出了作为光发射红外光探测器的由 P-Si上 SiGeB 合金得到的肖特基势垒,SiGeB 合金由300℃光增强化学汽相淀积(PECVD)得到,源气体用了SiH_4、GeF_4和 B_2H_6,得出的淀积于 P-Si 上的势垒高度     

室温下用离子束辅助淀积法在衬底上镀制MgF_2膜

实验在真空度为2×10~(-4)Pa的普通扩散泵浦高真空室中淀积MgF_2膜。当离子源工作时,这真空度降到10~(-2)Pa(充了氩气)。膜淀积在热源上方40cm处的25×12mm石英玻璃和PMMA衬底上。Kaufman型离子枪在衬底下方30cm处,与衬底法线成30°角。加了负偏压的1cm~2的离子探针用陶瓷架同蒸发物流隔开。淀积速率和膜的厚度用石英晶体控制。膜均以5A/Sec的速率淀积。参考膜不用离子束辅助法制作:一组淀积在室温衬底上,另一组淀积在加热到300℃的衬底上。用离子束     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.