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YANG WeiFeng ZHANG QingZhao WANG MingGang & XIA Yang Key Laboratory of Microelectronics Devices & Integrated Technology 《中国科学:信息科学(英文版)》2011,(8)
In this paper, the cone-shaped patterned sapphire substrates (PSS) were etched by an inductively couple plasma with BCl 3 as the reacting gas. The influence of the operating pressure and the RF bias power on subtrenches of the cone-shaped PSS and the formation mechanism of subtrenches were investigated. The profiles of patterns were characterized by FESEM (field emission scanning electron microscope). It showed that the subtrench size varied with the operating pressure and the RF bias power. As the operatin... 相似文献
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S.S.Batool Z.Imran M.Israr Qadir M.Usman H.Jamil M.A Rafiq M.M.Hassan M.Willander 《材料科学技术学报》2013,29(5):411-414
The effect of metal(Ti,Ni,and Au) electrodes on humidity sensing properties of electrospun TiO2 nanofibers was investigated in this work.The devices were fabricated by evaporating metal contacts on SiO2 layer thermally grown on silicon substrate.The separation between the electrodes was 90μm for all sensors.The sensors were tested from 40%to 90%relative humidity(RH) by AC electrical characterization at room temperature. When sensors are switched between 40%and 90%RH,the corresponding response and recovery time are 3 s and 5 s for Ti-electrode sensor,4 s and 7 s for Ni-electrode sensor,and 7 s and 13 s for Au-electrode sensor.The hysteresis was 3%,5%and 15%for Ti-,Ni-,and Au-electrode sensor,respectively.The sensitivity of Ti,Ni,and Au-electrode sensors are 7.53 MΩ/%RH,5.29 MΩ/%RH and 4.01 MΩ/%RH respectively at 100 Hz.Therefore Ti-electrode sensor is found to have linear response,fast response and recovery time and higher sensitivity as compared with those of Ni- and Au-electrode sensors.Comparison of humidity sensing properties of sensors with different electrode material may propose a compelling route for designing and optimizing humidity sensors. 相似文献
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Guo Pei Zhao Xiaohui Xiong Jie Xia Yudong Jing Tongguo Chen Jue Zhang Ning Zhang Fei Tao Bowan Li Yanrong State Key Laboratory of Electronic Thin Films Integrated Devices University of Electronic Science Technology of China Chengdu China 《稀有金属材料与工程》2011,(Z3)
In this study,a simple template consisted of Y2O3 and La2Zr2O7 (LZO) layers was fabricated on rolling assisted biaxially textured Ni-5at%W substrates for YBa2Cu3O7-δ (YBCO) coated conductors.A thin sputtered Y2O3 layer (~20 nm) was introduced as a seed layer in order to induce epitaxial growth of metal organic deposited LZO layer.The effects of Y2O3 layer,annealing temperature and dwelling time on the phase and texture of the LZO films were systematically investigated.X-ray diffraction exhibited that the LZ... 相似文献
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本文对用蒸发法制备的非晶和多晶碲镉汞(Hg_(1-x)Cd_xTe)薄膜的结构特性及其光学和电学性质进行了研究。在800—2600nm的波长范围内测量了样品的透过率,得到了非晶和多晶状态相应的光学隙分别为1eV以上和0.65eV左右。对非晶样品的退火实验发现,在90—100℃区间退火使非晶样品的结构转变为多晶,同时电阻率突然变小约5个数量级和光学隙由1eV以上突变为0.62eV左右。在20—300K的温度范围内,分别测量了非晶与多晶样品的电阻率,所得结果可用现代非晶半导体理论进行解释。 相似文献
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本文使用单带双谷理论研究了GaAs/AlGaAs量于阱中的Г-X混和现象.介绍了Г态、X态和能级高于势垒的谐振态的特点.给出了谐振态能级随势阱和势垒层宽变化的关系.阐述了超薄层量子阱和非限定态的一些有趣的特性.在此基础上提出了一个超晶格能带的形成模型并对最新的一些实验结果给出了恰当的解释. 相似文献
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LI Guang & WANG LiHua School of Physics Materials Science Anhui Key Laboratory of Information Materials Devices Anhui University Hefei China 《中国科学:信息科学(英文版)》2011,(9)
The structural,electronic and magnetic properties of La0.55Ca0.45MnO3 were measured.A rapid change of lattice parameters appeared around 190 K associated with the d z2 orbital ordering and charge ordering (CO) states that were reflected by both magnetization and resistivity.Great difference of magnetizations between the field-cooling (FC) and zero-field-cooling (ZFC) modes below the charge ordering temperature TCO in high magnetic field (H > 4 T) was clearly seen.A field of 5 T (threshold field) is sufficie... 相似文献
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SHANG LiWei JI ZhuoYu CHEN YingPin WANG Hong LIU Xin HAN MaiXin & LIU Ming Key Laboratory of Nanofabrication Novel Devices Integration Technology 《中国科学:信息科学(英文版)》2011,(1)
Low voltage operating organic devices and circuits have been realized using atomic layer deposition deposited aluminum oxide thin film as dielectric layer. The dielectric film has per unit area capacitance of 165 nF/cm2 and leakage current of 1 nA/cm2 at 1 MV/cm. The devices and circuits use the small-molecule hydrocarbon pentacene as the active semiconductor material. Transistors,inverters,and ring oscillators with operating voltage lower than 5 V were obtained. The mobility of organic field-effect transis... 相似文献
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BAI YiMing WANG Jun WANG Yu ZHANG Han CHEN NuoFu YAO JianXi HUANG TianMao WANG YanShuo ZHANG XingWang & WU JinLiang New Renewable Energy of Beijing Key Laboratory North China Electric Power University Beijing China National Engineering Research Center for Optoelectronic Devices 《中国科学:信息科学(英文版)》2011,(4)
A novel interconnected structure consisting of a conventional polyimide layer(PM) and an additional SiO2/TiAu/SiO2 sandwich multilayer has been firstly proposed for improving the performance of GaAs micro-solar cell array.The specific experimental investigations on the array with 108 unit cells have demonstrated that the novel structure of PM/SiO2/TiAu/SiO2 can effectively enhance the open-circuit voltage from 75 to 84 V and the fill factor from 35% to 57%.The performance improvement of our devices can be a... 相似文献
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Joanne Mistler Analog Devices Wilmington 《电子与电脑》2005,(5):34-35
对于现今的无线与有线通信系统开发人员而言,其所面临的挑战来自于系统所要求的更低噪声、更高速度、多载波、更大的频宽、以及更快的部署速度。图1所示为一高速的转换器(converter),该转换器提供了测量信号信道中的功率放大器前失真(pre-distortion)、接收信号信道中的基频(I/Q)信号检出、以及传送信号信道中的调变。设计人员对于转换器架构、参考设计、及模型工具的熟悉度,能让他们为其所设计的系统选出最合适的转换器。转换器的设置会直接影响到系统在侦测低位准信号的能力,特别是在有干扰的情况下。设计人员必须在能够满足尺寸大小、成… 相似文献