Enhanced Polar Magneto-optical Kerr Rotation in Cobalt Thin Film Incorporating Ag Nanoparticles

We report an experimental study on the effect of Ag nanoparticles on the polar magneto-optical Kerr effect in cobalt thin film. The magneto-optical cobalt thin film was prepared by electron beam deposition method onto the Ag nanoparticles which were synthesized by laser ablation in liquid technique. Our results indicate that we have sufficient enhancement of polar magneto-optical Kerr effect of cobalt thin film around the surface plasmon resonance of Ag nanoparticles. Moreover, combination of surface plasmon resonance of the Ag nanoparticles and very thin Au layer can be attained the enhancement factor in all of visible spectral region.     

一种测量薄膜磁性的表面磁光克尔效应装置

介绍表面磁光克尔效应谱（SMOKE）的一种新方案。通过适当分光并测量信号束和参考束的光强比，可以明显改善由于激光的光强不稳造成的误差，还使得随机偏振激光器也能用于SMOKE装置。同时该方案中没有采用信号调制，因此对探测器等硬件要求很低。实验结果表明，采用光强稳定度为5％的普通国产He－Ne随机偏振激光器，其测量灵敏度能够达到目前国际上通常用于超薄膜磁性测量的SMOKE的同类水平。     

Theory of Non-linear Longitudinal Kerr Magneto-optic Effect in a Ferromagnetic Metallic Thin Film

A theory of the non-linear longitudinal Kerr magneto-optic effect, previously developed for bulk materials [1], is now applied to a magnetic thin film. The material model is based on the classical equation of motion for a free electron with a finite relaxation frequency under the action of a Lorentz force. A second harmonic current density, dependent upon three non-linear conductivity tensors, reduces to results obtained by Jha [2] in the limit of vanishing ferromagnetic state. The second harmonic reflection coefficients are approximated and are given in terms of the first harmonic reflection coefficients as derived by Smith [3].     

半导体CdTe薄膜电化学沉积研究

本文研究半导体ＣｄＴｅ薄膜在ＩＴＯ透明导电玻璃基底上的电化学沉积。分析了电化学沉膜过程以及反应机理，对不同电参数下沉积膜进行了性能表征，研究了温度、沉积电压等参数对膜性能的影响，探讨了制备颗粒细小、均匀性好并具有一定择优取向的ＣｄＴｅ薄膜的方法。     

非晶LiSiON薄膜电解质的全固态薄膜锂电池性能

全固态薄膜锂电池(TFLB)是理想的微电子系统电源.目前报道的固态非晶电解质存在离子电导率偏低的问题,限制了TFLB性能的提升.本工作采用磁控溅射法制备了一种新型非晶锂硅氧氮(LiSiON)薄膜用作TFLB的固态电解质.结果表明,优化制备条件后的LiSiON薄膜具有6.3×10–6 S·cm–1的高离子电导率以及超过5...     

薄膜太阳能电池

薄膜太阳能电池作为一种新的能源材料正在得到迅速的发展和进步,主要介绍了非晶硅、多晶硅薄膜太阳能电池以及CIGS薄膜太阳能电池,通过比较这几种薄膜太阳能电池各自的特点阐述了各种薄膜太阳能电池的发展状况.     

有机薄膜的电致发光

合成了发光色素荧光黄，制备了以荧光黄为发光材料的有机薄膜电致发光器件，测定了它的电光性质，得到了在直流驱动电压６Ｖ下的绿色发光，并探讨了荧光黄的发光机理。     

碲化镉薄膜太阳能电池及其溅射制备

简单综述了化舍物半导体碲化镉太阳能电池的发展历史、基本结构和核心问题,在此基础上重点总结了用溅射法制备的多晶碲化镉薄膜太阳能电池的优缺点、面临问题、发展现状,展望了它的发展趋势,并讨论了用溅射法制备渐变带隙碲化镉薄膜太阳能电池以提高转化效率的可能性.     

氮化铁薄膜中反常霍尔效应的研究

通过磁控溅射方法制备了氮含量不同的氮化铁薄膜,观察到随着氮含量的增加,薄膜的导电机制从金属到半导体的转变。霍尔电阻的测量表明在高电阻区域反常霍尔电阻率与纵向电阻率的标度律为线性,即反常霍尔效应遵循斜散射机制,但相应的反常霍尔电导率与纵向电导率的关系不总是线性。     

有机薄膜太阳能电池

有机太阳能电池作为一种新兴的有着巨大潜力的光电转换器件,吸引了越来越多的关注。综述了有机薄膜太阳能电池主要的两种器件结构的研究进展,即基于无机异质结发展出来的双异质结型有机太阳能电池和基于扩展双层异质结活性层受限的接触面积而提出的体异质结型太阳能电池;阐述了这两种器件结构的工作原理、影响有机太阳能电池光电转换效率的因素以及两种结构的不足之处,并展望了有机太阳能电池发展的广阔前景。     

Buckling Of Thin Film Thermoelectrics

This work investigates buckling behavior of thin film thermoelectrics subjected to a temperature gradient. Both a single-layer thermoelectric film and multilayered structures are studied. The multilayered structure consists of a p-type and n-type thermocouple separated by an insulating layer with or without additional supporting membrane layers. The temperatures, and thermoelectrically induced stresses and membrane forces are first presented. The elastic stability theories of homogeneous plates and laminated composites are subsequently used to determine the temperature differential between the hot and cold junctions that causes buckling of the thin film structures. The numerical results show that a single-layer thermoelectric film could buckle at a temperature differential of around 10 K for large length-to-thickness ratios. The multilayered thermoelectric thin film structures exhibit significantly higher buckling temperature differentials due to reduced overall length-to-thickness ratios.     

薄膜气敏材料的性能和研制薄膜气敏元件的工艺探索

给出了薄膜气敏材料性能的测试结果：存在最佳灵敏度膜厚l *（ l *≈1500?）;动态特性;膜越薄响应越快;存在最佳掺杂（ CeO2）量x%,x的取值范围为5~15。提出了复合绝缘膜Si/SiO2/Al2 O3衬底;提出了研制薄膜的粉末溅射;给出了研制电导气敏薄膜元件的工艺流程,并对各工艺进行了必要的说明。     

薄膜膜系计算的计算机程序设计

根据膜堆的特征矩阵,求出单层膜的光学导纳,在单层膜的基础上,进行层层递推,叠加起来,求出膜块的等交内,计算振幅反射系数,最后求出整个膜系的反射率、透射率。     

AlN薄膜的研究进展

AlN是一种性能优异的宽带隙Ⅲ-Ⅴ族氮化物半导体材料,在电、光和机械领域展现了极大的应用前景.结合国内外研究的热点问题和各科研团体最新的研究成果,从AlN的性质、AlN薄膜的制备方法、国内外AlN薄膜的最新研究进展及AlN薄膜的应用等4个方向进行了详细阐述.     

热电薄膜与薄膜温差电池研究进展

热电材料是一种能够实现热能和电能直接相互转换的绿色环保型功能材料。近年来研究发现,薄膜热电材料及其器件有高的热电转换效率和实用性,具有重要的研究价值和市场实用价值。本文首先介绍国内外低温B-i Sb-Te系热电薄膜材料的研究现状,在阐述提高B-i Sb-Te系薄膜热电材料性能的方法、途径以及其应用的基础上,介绍了热电薄膜制备技术方面的关键科学问题所在。其次介绍了国内外薄膜温差电池的研究进展和发展趋势。在总结薄膜热电材料及其器件发展历史和分析热电理论的基础上,阐述了薄膜温差电池方面的研究进展和关键技术所在。     

Thin Film Inspection with Millimeter-Wave Reflectometer

Abstract

Inspection of dielectric thin films (25.4–508 μm) placed directly above a conducting plate is performed with a W-band millimeter-wave network analyzer. The signal launched by a small antenna placed near the sample surface is picked up by a separate receiver. The phase of the received signal can be related to the thickness and permittivity of the thin films under inspection. While the transmitter and receiver are at larger distances from the dielectric surface, the system operates as a conventional reflectometer. But when they both are close to the surface, guided waves will be excited and even may become dominant over the direct reflection. The significance of the guided-wave contribution is controlled by the locations of the guided-wave poles in the complex k _ρ -plane. In this paper we employ a modal approach that previously was developed for geophysical remote sensing to study the effects of the guided waves, and to outline the limits of the conventional reflectometric method for evaluating thin films.