薄膜厚埋层SOI材料的新制备技术

在结合低剂量注氧隔离(SIMOX)技术和键合技术的基础上,研究了制备薄膜(薄顶层硅膜)厚埋层SOI材料的新技术--注氧键合技术.采用该新技术成功制备出薄膜厚埋层SOI材料,顶层硅厚度130nm,埋氧层厚度lμm,顶层硅厚度均匀性±2%.并分别采用原子力显微镜(AFM)和剖面透射电镜(XTEM)对其表面形貌和结构进行了表征.研究结果表明,SIMOX材料顶层硅通过键合技术转移后仍能够保持其厚度均匀性,且埋氧层和顶层硅之间具有原子级陡峭的分界面,因此注氧键合技术将会是一项有广阔应用前景的SOI制备技术.     

SOI材料微结构的TEM分析

SOI晶圆材料正在成为制备IC芯片的主要原材料.SOI材料的质量很大程度上取决于顶层硅及埋层的结构.利用TEM,系统地研究了3种实验条件下的SOI材料的微结构,对其顶层硅及埋层的厚度、厚度的均匀性进行了定量分析,对高剂量SIMOX样品中存在的硅岛密度进行了估算,并对顶层硅中的结构缺陷进行了观察分析.     

SIMOX薄膜材料的红外光谱特性和薄膜厚度的非破坏性测量方法

报道了 SOI材料薄膜厚度的非破坏性快速测量方法 ,详细地研究了 SIMOX材料的红外吸收光谱特性 ,求出了特征峰对应的吸收系数 .提出利用红外吸收光谱测量 SIMOX绝缘埋层厚度的非破坏性方法 ,并根据离子注入原理计算出表面硅层的厚度 .SIMOX薄膜的表层硅和绝缘埋层的厚度是 SOI电路设计时最重要的两个参数 ,提供的非破坏性测量方法 ,测量误差小于5% .在 SIMOX材料开发利用、批量生产中 ,用此方法可及时方便地检测 SIMOX薄膜的表层硅和绝缘埋层的厚度 ,随时调整注入能量和剂量     

SIMOX薄膜材料的红外光谱特性和薄膜厚度的非破坏性测量方法

报道了SOI材料薄膜厚度的非破坏性快速测量方法,详细地研究了SIMOx材料的红外吸收光谱特性,求出了特征峰对应的吸收系数.提出利用红外吸收光谱测量SIMOX绝缘埋层厚度的非破坏性方法,并根据离子注入原理计算出表面硅层的厚度.SIMOX薄膜的表层硅和绝缘埋层的厚度是SOI电路设计时最重要的两个参数,提供的非破坏性测量方法,测量误差小于5％.在SIMOX材料开发利用、批量生产中,用此方法可及时方便地检测SIMOX薄膜的表层硅和绝缘埋层的厚度,随时调整注入能量和剂量.     

半导体材料

0205855低剂量 SIMOX 圆片线缺陷的针孔的研究[刊]/郑望//功能材料与器件学报.—2001.7(4).—431～433(C)用 Secco 法、Cu-plating 法分别表征了低剂量SIMOX 圆片顶层硅线缺陷、埋层的针孔密度。结果显示,低剂量 SIMOX 圆片的顶层硅缺陷密度低,但埋层质量稍差。通过注入工艺和退火过程的进一步优化,低剂量 SIMOX 将是一种有前途的 SOI 材料制备工艺。参7     

用两次键合技术制备均匀单晶硅膜

硅直接键合(SDB)技术用于制备SOI片(BESOI)是键合技术的最重要应用之一,研究了制备BESOI片中的键合和减薄问题,获得了大面积的均匀单晶硅膜,通过实验分析了这种方法获得的薄膜的平整度和影响因素。并针对压力传感器的敏感膜,通过两次键合及SOI自停止腐蚀成功制备了厚度可控的均匀单晶硅薄膜,硅膜表面质量优良,平整度在±0.15μm的范围内。     

具有非平面埋氧层的新型SOI材料的制备

提出一种基于SDB技术的非平面埋氧层SOI材料制备方法.其关键技术包括:通过干法刻蚀、高压氧化和淀积二氧化硅获得高质量非平面埋氧层;通过化学气相淀积多晶硅来形成键合缓冲层,并运用回刻光刻胶和化学机械抛光来实现键合面的局部和全局平坦化;通过室温真空贴合、中温预键合和高温加固键合来进行有源片和衬底片的牢固键合.基于该技术研制了有源层厚度为21μm、埋氧层厚度为0.943μm、顶面槽和底面槽槽高均为0.9μm的具有双面绝缘槽结构的非平面埋氧层新型SOI材料.测试结果表明该材料具有结合强度高、界面质量好、电学性能优良等优点.     

具有非平面埋氧层的新型SOI材料的制备

提出一种基于SDB技术的非平面埋氧层SOI材料制备方法.其关键技术包括:通过干法刻蚀、高压氧化和淀积二氧化硅获得高质量非平面埋氧层;通过化学气相淀积多晶硅来形成键合缓冲层,并运用回刻光刻胶和化学机械抛光来实现键合面的局部和全局平坦化;通过室温真空贴合、中温预键合和高温加固键合来进行有源片和衬底片的牢固键合.基于该技术研制了有源层厚度为21μm、埋氧层厚度为0.943μm、顶面槽和底面槽槽高均为0.9μm的具有双面绝缘槽结构的非平面埋氧层新型SOI材料.测试结果表明该材料具有结合强度高、界面质量好、电学性能优良等优点.     

低剂量SIMOX圆片研究

用二次离子质谱、剖面透射电镜、高分辨电镜以及化学增强腐蚀法表征了低剂量 SIMOX圆片的结构特征 .结果显示 ,选择恰当的剂量能量窗口 ,低剂量 SIMOX圆片表层 Si单晶质量好、线缺陷密度低埋层厚度均匀、埋层硅岛密度低且硅 /二氧化硅界面陡峭 .这些研究表明 ,低剂量 SIMOX圆片制备是很有前途的 SOI制备工艺     

AlN薄膜室温直接键合技术

采用离子束增强沉积技术在100mm硅片上制备大面积均匀AlN薄膜,原子力显微镜(AFM)显示其表面平整光滑,均方根粗糙度(RMS)为0.13nm,满足直接键合的需要.同时,采用智能剥离技术成功实现了室温下AlN与注氢硅片的直接键合,形成了以AlN薄膜为埋层的SOI结构,即AlN上的硅结构(SOAN).用扩展电阻、卢瑟福背散射-沟道、剖面透射电镜等技术分析了所形成的SOAN结构.     

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.     

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.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

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.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.