平面波导光传感器的研究进展

高灵敏度的光传感技术在工业过程控制、环境监测、食品安全、国家安全等领域具有重要的应用.随着平面光集成制备技术的发展,光传感器件也从研究开发光纤传感器拓展到便于集成的平面波导光传感器,特别是采用多孔、易掺杂的溶胶一凝胶材料作为化学、生物医学探测的光传感媒介.综述了平而波导光传感器的研究现状与发展趋势,讨论了器件的光传感原理与结构,介绍了其在化学、生物医学、环境检测等方面的虚用.     

Effects of vacancy structural defects on the thermal conductivity of silicon thin films

Vacancy structural defect effects on the lattice thermal conductivity of silicon thin films have been investigated with non-equilibrium molecular dynamics simulation.The lattice thermal conductivities decrease with increasing vacancy concentration at all temperatures from 300 to 700 K.Vacancy defects decrease the sample thermal conductivity,and the temperature dependence of thermal conductivity becomes less significant as the temperature increases.The molecular dynamics result is in good agreement with the theoretical analysis values obtained based on the Boltzmann equation.In addition,theoretical analysis indicates that the reduction in the lattice thermal conductivity with vacancy defects can be explained by the enhanced point-defect scattering due to lattice strain.     

阴极铝箔化学腐蚀工艺研究──Ⅱ．关于阴极铝箔容量衰减问题

在３０％酒石酸铵溶液中用恒定阳极电流测定阴极箔的计时电压（Ｅ－ｔ）曲线，根据曲线转折电压Ｅ转判断表面氧化膜相对厚度，发现膜厚与电容量有很好对应关系。用ｐＨ＝２磷酸钝化液处理的箔在刚生产出来时表面氧化膜很薄，随时间增厚，容量下降幅度大。改用ｐＨ＝３．４磷酸钝化液，形成的氧化膜较厚，较稳定，容量下降得到改善。对此作了分析探讨。     

钨硅化物砷化镓Schottky接触的形成和特性

本文报道了钨硅化物-砷化镓Schottky接触的形成过程和电学特性.实验表明,WSi_x/GaAs Schottky接触具有优越的I-V特性,势垒高度保持在0.8V,理想性因子实际上保持在1,并具有高温稳定性.研究表明,除了硅化物的成份,表面处理工艺和硅化物淀积技术也将对Schottky接触的I-V特性和热稳定性产生强烈的影响.本文提出利用对GaAs衬底的溅射腐蚀和在淀积过程中加以负的衬底偏置能显著地改进金属层与衬底的粘附性.     

二维离子注入的改进模型及数值模拟

本文提出了一个改进的二维离子注入模型.对于在任意形状掩蔽边界下的离子注入分布,我们在纵向采用联结的半高斯分布或修改过的Pearson-IV分布,在横向采用余误差函数分布,并且考虑了在多层掩蔽情况下各种材料阻止本领的不同.利用这一模型发展起来的离子注入模拟器能连续计算多次不同能量、剂量和杂质类型的注入分布,并考虑了多种不同掩蔽边界的影响.通过与其它工艺模拟器的比较,表明我们的模拟器在精度和功能上都有明显的改进.     

未来弹性与AES

介绍了未来弹性的概念,对将未来弹性引入AES评估标准的优点进行了探讨,以来来弹性的观点分析了第二轮AES候选算法的遴选并提出了具体建议。     

一种亚微米垂直硅墙的刻蚀方法

亚微米垂直硅墙的制备是垂直硅薄膜耦合约瑟夫逊结的关键工艺.本文作者在普通光刻设备基础上,开发了一种在〈100〉硅片上制备亚微米硅墙的刻蚀方法:首先用普通光刻手段刻出较宽的墙区;其次,对非墙区进行迭加注入掺杂;第三,杂质高温横向扩散,第四,掺杂选择性刻蚀;第五,高温氧化减薄.实验结果表明,这种方法可以获得墙宽为0.29μm,墙高为1μm左右的硅墙,而且还有一定的改进潜力.     

自聚焦介质波导中的新型导波

本文给出了导波层为自聚焦介质平板波导波方程的特殊精确解,得到了具有非线性导波层的波导归一化色散方程及场分布,并对得出的结果进行了讨论。     

An electrically conductive metallocycle: densely packed molecular hexagons with π-stacked radicals

Electrical conduction among metallocycles has been unexplored because of the difficulty in creating electronic transport pathways. In this work, we present an electrocrystallization strategy for synthesizing an intrinsically electron-conductive metallocycle, [Ni₆(NDI-Hpz)₆(dma)₁₂(NO₃)₆]·5DMA·nH₂O (PMC-hexagon) (NDI-Hpz = N,N′-di(1H-pyrazol-4-yl)-1,4,5,8-naphthalenetetracarboxdiimide). The hexagonal metallocycle units are assembled into a densely packed ABCABC… sequence (like the fcc geometry) to construct one-dimensional (1D) helical π-stacked columns and 1D pore channels, which were maintained under the liberation of H₂O molecules. The NDI cores were partially reduced to form radicals as charge carriers, resulting in a room-temperature conductivity of (1.2–2.1) × 10⁻⁴ S cm⁻¹ (pressed pellet), which is superior to that of most NDI-based conductors including metal–organic frameworks and organic crystals. These findings open up the use of metallocycles as building blocks for fabricating conductive porous molecular materials.

Intrinsically electron-conductive metallocycle was synthesized. π-Radicals play a key role in constructing π-stacked columns among molecular hexagons and achieving high electrical conductivity over 10⁻⁴ S cm⁻¹ in polycrystalline pellet.