Effects of post-lift-off annealing conditions on contact oxidation of Ti–Au top-contacts in In-Sn–Zn–O TFT

Thin film transistors (TFT) with an indium based mixed oxide semiconductor are investigated for titanium–gold top-contacts. It is noticed that upon post annealing, in order to remove chemical residuals from top-contact lift-off steps, oxidation of titanium occurs depending on the annealing conditions. Mobility of the TFT is strongly affected by contact oxidation arising from this post lift-off annealing process. Oxidation of the top-contact is facilitated by adsorbed surface oxygen or out-diffusing oxygen from the semiconductor depending on the post lift-off annealing conditions. A passivation layer that binds effectively to surface vacancies and removes adsorbed oxygen species from the semiconductor surface is demonstrated. The combinations of this passivation layer with relatively low temperature and short post lift-off annealing in an oxygen deficient environment result in significantly reduced contact oxidation and subsequently better transistor performance. Contact resistance as low as 90 Ω cm and mobility as high as 5.3 cm²/V s are obtained for solution processed mixed metal oxide semiconductor in top-contact geometry.     

国内外聚烯烃流化床技术专利分析

采用流化床进行烯烃聚合是聚烯烃制备的核心技术之一,本文以全球聚烯烃流化床技术相关专利为研究对象,从全球专利申请趋势、专利技术来源与布局等角度,研究了全球聚烯烃流化床专利技术的分布情况,并采用文本聚类、技术功效矩阵、合作网络分析等方法,分析领域技术发展趋势、主要技术分布以及全球技术竞争格局,同时针对核心申请人进行重点技术分析,为我国聚烯烃流化床技术的发展提供参考依据。分析表明：聚烯烃流化床领域技术处于技术稳定期,且存在明显的技术垄断现象,美国技术实力最强,中国属于技术输入国,本土技术研发实力与美国存在较大差距;催化剂研究是领域研究的重点方向,围绕聚合反应器方面的研究逐步成为热点;针对冷凝工艺与回收分离工艺的改进探索相对较少,国内企业与研发机构可以作为技术突破的方向。     

伪装网遮蔽目标多波段多极化SAR图像融合检测

针对伪装网遮蔽作为对抗侦察与监视的常见手段,而多波段多极化SAR图像具有提供被遮蔽目标互补性的不同特性信息的特点;本文提出基于改进Neyman-Pearson准则的决策级融合算法,实现对伪装网遮蔽目标的检测.该方法根据理论定性分析与实测数据定量分析,探讨了波段、极化方式对伪装网遮蔽目标探测的影响,并比较了像素级与决策级...     

RF-CMOS建模:一种改进的累积型MOS变容管模型

提出一种改进的累积型MOS变容管射频模型,改进后模型方程可精确描述累积型MOS变容管全工作区域特性;模型方程连续,且任意阶次可导,至少三阶导数求解结果可实现与测试结果的精确拟合,解决了原模型可导但导数错误、变阻方程不连续等问题.模型最终应用到采用CSM(Chartered Semiconductor Manufacture Ltd)0.25μm RF-CMOS工艺制造的一30栅指(每指尺寸为长L=1μm,宽W=4.76μm)累积型MOS变容管建模中,测量和仿真所得C-V,R-V特性,品质因素以及高达39GHz S参数对比结果验证了模型的良好精度.     

基于事例推理的胶印质量管理专家系统

基于事例推理具有获取知识方便、易于理解、启发思维等特点,介绍了CBR的概念和关键技术,并将其应用于胶印质量控制领域.分析研究了基于事例的推理在胶印质量控制系统中应用的可行性,结果表明优于传统的基于规则的推理.     

Modeling large reversible electric-field-induced strain in ferroelectric materials using 90° orientation switching

Reversible large electric-field-induced strain caused by reversible orientation switchings in BaTiO3 is modeled using the Landau's theory of phase transition. A triple well free energy function is constructed. Each of its minima is associated with one of the polarization orientations involved. Nonlinear constitu- tive laws accounting for reversible orientation switchings and electrostriction effects are obtained by using thermodynamic equilibrium conditions. Hysteretic dynamics of one-dimensional structures is described by coupled nonlinear differential equations. Double hysteretic loops in the electric and me- chanic fields are both successfully modeled. Giant reversible electrostriction is modeled as a conse-quence of reversible orientation switchings via electro-mechanical couplings. Comparisons with ex-perimental results reported in literatures are presented.     

一个可处理多种约束的多层布线通孔最少化算法

本文分析了常用的VLSI多层布线图模型线段－相交图SCG的局限性,提出了对SCG模型的修正,并基于该模型用模拟退火算法来解决通孔最少化问题,算法可以处理严格和非严格分层的布线,并考虑了许多物理约束的处理方法.实验证明算法可以较大程度地减少通孔.     

PHASE－LOCKED 2－D JOSEPHSON JUNCTION ARRAYS AS SUBMILLIMETER OSCILLATORS

This letter presents the results of numerical simulations for phase-locked 2-D Josephson junction array oscillator.The simulation result shows that the junctioons of 2-D array can mutually phase-locked in a considerable area if the parameters can be carefully selected.The oscillators are formed with up to 33 identical Nb/AlOx/Nb junctions,and the junctions are connected with Nb microstrip resonators.Optimum structure parameters for ocsillator circuit design can be obtained with these simulation results.     

FSM状态间逻辑条件检验的算法研究

有限状态机(FSM)是VLSI控制结构的一种映射,它的自动综合成为设计自动化的一个十分重要的环节和途径。本文讨论在FSM自动综合中输入阶段的状态间逻辑条件检验的问题,研究分析状态间逻辑条件检验的相互关系及影响,并提出了FSM状态间逻辑条件检验的优化算法,从而使时间复杂度降低,实现更加简便。最后,本文给出了优化算法的流程和一些实验结果,结果令人满意。     

快速书面汉语自动分词系统及其算法设计

本文针对机械分词,提出词典组织结构、改进的二分法检索、直接匹配算法,以及后缀分词算法。运用这些技术,正逆向切分可共用一部词典,并显著提高分词速度。