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Growth of C_(60)(111) single crystalline thin film on Ni_3Co(111) substrate

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Chinese Science Bulletin 1997年第18期42卷 1526-1529页

作者： HOU Jianguo, ZENG Jianlin, WANG Yan, LI Yongqing and WU ZiqinStructure Research laboratory and Center for Fundamental Physics, University of Science and Technology of china, Hefei 230026, china Structure Research laboratory anci Center for Fundamental Physics University of Science and Technology of China Hefei China

SINCE the discovery of a simple graphite-arc method which can produce grams of C60, the growth of high quality C60 films on various substrates has been one of the main subjects for fullerene research. It is reported that the growth behavior of C60 films is determined by geometrical matching and the bonding properties between C60 lattice and the surface of substrate. Much work has been done to investigate the growth and structure of C60 films on various nonmetallic substrates, such as graphite, MoS2, mica and NaCl. The interactions between C60 and nonmetallic substrates are van der Walls forces, so the growth of C60 on these

关键词： fullerene thin film growth metal substrate.

Structure and Optical Properties of Lanthanum Modified Lead Zirconate Titanate Ferroelectric thin films

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Structure and Optical Properties of Lanthanum Modified Lead ...

Experimental and numerical analyses of high voltage 4H-SiC junction barrier Schottky rectifiers with linearly graded field limiting ring

第二届全国压电和声波理论及器件技术研讨会

作者： Chuanren Yang,Wenjian Leng,Jihua Zhang,Hongwei Chen,Hong Ji,Wenchen Hu (State Key laboratory of Electronic thin films and Integrated Devices, University of Electronic Science and Technology of china,Chengdu 610054,P.R.china)

The integration of the Pb-based ferroelectric thin films with semiconductors is highly attractive due to their potential applications including monolithic optoelectronic integrated circuits,advanced metal-oxide-semiconductor structures,and multi-functional optoelectronic ***-modified lead zirconate titanate with a[Zr]/[Ti]ratio of 65/35(PLZT) and La contents between 4 and 14 at.%are relaxor *** ferroelectric thin film is an excellent candidate material for this integration due to its strong EO effect,large spontaneous polarization,and high transparency in the visible and *** be suitable for these applications,PLZT thin films require epitaxial growth,high crystalline properties, high optical index,and low surface roughness.

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Chinese Physics B 2014年第5期23卷 490-494页

作者：王向东邓小川王永维王勇文译张波 State Key laboratory of Electronic thin films and Integrated Devices University of Electronic Science and Technology of China National Key laboratory of ASIC

This paper describes the successful fabrication of 4H-SiC junction barrier Schottky （JBS） rectifiers with a linearly graded field limiting ring （LG-FLR）. Linearly variable ring spacings for the FLR termination are applied to improve the blocking voltage by reducing the peak surface electric field at the edge termination region, which acts like a variable lateral doping profile resulting in a gradual field distribution. The experimental results demonstrate a breakdown voltage of 5 kV at the reverse leakage current density of 2 mA/cm2 （about 80% of the theoretical value）. Detailed numerical simulations show that the proposed termination structure provides a uniform electric field profile compared to the conventional FLR termi- nation, which is responsible for 45% improvement in the reverse blocking voltage despite a 3.7% longer total termination length.

关键词： 4H-SiC junction barrier Schottky rectifier linearly graded field limiting ring breakdown voltage

Surface Microstructure Characterization of Sol-gel Derived Porous TiO_2 thin films

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Rare Metals 2001年第3期20卷 157-163页

作者： Jiaguo Yu, Jimmy C. Yu, Bei Cheng, A. S. K. Li, Pak Kan Tse 1) Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, china 2) State Key Lab of advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, W 香港中文大学香港武汉工业大学材料复合新技术国家重点实验室湖北武汉 430070

Porous TiO2 thin films were prepared from alkoxide solutions with and without polyethylene glycol (PEG) by sol-get route on soda lime glass, and were characterized by atomic force microscopy (AFM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results show that TiO2 film prepared from precursor solution without PEG is composed of spherical particles of about 100 nm and several nanometer mesoporous pores. With the increase of the amount of PEG added to the precursor solution, the diameter and the depth of the pores in the resultant films increas on the decomposition of PEG during heat-treatment, which lead to them increase of the surface roughness of the films. XRD and TEM results show that the single anatase phase is precipitated and there are some orientation effects in (101) direction.

关键词： sol-gel route porous TiO2 thin films surface microstructure characterization

KTN thin films prepared by pulsed laser deposition on transparent single crystal quartz(100)

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Science china(Physics,Mechanics & Astronomy) 2005年第1期48卷 33-43页

作者： WANG Xiaodong, PENG Xiaofeng & ZHANG Duanming laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084, china Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, china laboratory of Phase Change and Interfacial Transport Phenomena Department of Thermal Engineering Tsinghua University Beijing 100084 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

Using the Sol-Gel method to produce the KTN ultrafine powder and the sintering technique with K2O atmosphere to prepare KTN ceramics as the targets instead of the KTN single crystal, highly oriented KTN thin films were produced on the transparent single crystal quartz (100) by the pulsed laser deposition (PLD). Since the thermal stress sustained by the quartz is relatively small, the limit temperature of the quartz substrates(300℃) is much lower than that of the P-Si substrates (560℃); the prepared thin film is at amorphous state. Increasing the pulsed laser energy density in the process incorporated with annealing the film after deposition at different temperatures converts the amorphous films into crystal. The optimal pulsed laser energy density and annealing temperature were 2.0 J/cm2 and 600℃, respectively. A discussion was made to understand the mechanism of film production at relatively low substrate temperature by PLD and effects of the annealing temperatures on the forming of the perovskite phase, and optimal conditions for the orientation of the crystal grain.

关键词： PLD technology, KTN thin film, single crystal quartz, pulsed energy density, annealing, perovskitephase.

Sorption of Eu(Ⅲ) on GMZ bentonite in the absence/presence of humic acid studied by batch and XAFS techniques

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Science china Chemistry 2010年第6期53卷 1420-1428页

作者： HU Jun1,2,XIE Zhi3,HE Bo3,SHENG GuoDong1,CHEN ChangLun1,LI JiaXing1,CHEN YiXue2 & WANG XiangKe1 1Key laboratory of Novel thin Film Solar Cells Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,china 2School of Nuclear Science and Engineering,North china Electric Power University,Beijing 102206,china 3National Synchrotron Radiation laboratory,University of Science & Technology of china,Hefei 230029,china Key laboratory of Novel thin Film Solar Cells Institute of Plasma Physics Chinese Academy of Sciences Hefei China School of Nuclear Science and Engineering North China Electric Power University Beijing China National Synchrotron Radiation laboratory University of Science & Technology of China Hefei China

Bentonite has been extensively studied because of its strong sorption ability and low *** this work,the Na-bentonite from Gaomiaozi County (china) has been characterized by XRD,FTIR and acid-base *** sorption of Eu(III) on Na-bentonite in the absence/presence of humic acid (HA) was studied at T = 25 ± 2 °C and in 0.01 mol/L NaClO4 *** effects of pH,HA,contact time and initial Eu(III) concentrations were also *** results indicate that the sorption of Eu(III) on Na-bentonite was dependent on pH *** presence of HA had little effect on Eu(III) sorption at low pH values,but decreased Eu(III) sorption at high pH values.X-ray absorption fine structure spectroscopy (XAFS) was applied to characterize the local structural environment of the adsorbed Eu(III) on bare Na-bentonite and HA-bentonite *** re- sults indicate that Eu(III) was bound to O atoms at a distance of about 2.39  at pH *** results are crucial for the evalua- tion of the sorption and migration of other trivalent lanthanides and actinides in bentonite as backfill materials.

关键词： Na-bentonite Eu(III) sorption humic acid XAFS

Quantifying the effectiveness of SiO_2/Au light trapping nanoshells for thin film poly-Si solar cells

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Science china(Technological Sciences) 2010年第8期53卷 2228-2231页

作者： BAI YiMing 1 ,WANG Jun 2 ,CHEN NuoFu 1,3 ,YAO JianXi 1 ,YIN ZhiGang 3 ,ZHANG Han 3 , ZHANG XingWang 3 ,HUANG TianMao 3 ,WANG YanShuo 3 &YANG XiaoLi 3 1School of Renewable Energy Engineering,North china Electric Power University,Beijing 102206,china 2 National Engineering Research Center for Optoelectronic Devices,Institute of Semiconductors, Chinese Academy of Sciences,PO Box 912,Beijing 100083,china 3 Key laboratory of Semiconductor Materials Science,Institute of Semiconductors, Chinese Academy of Sciences,PO Box 912,Beijing 100083,china School of Renewable Energy Engineering North China Electric Power University Beijing China National Engineering Research Center for Optoelectronic Devices Institute of Semiconductors Chinese Academy of Sciences Beijing China Key laboratory of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences Beijing China

In order to enhance light absorption of thin film poly-crystalline silicon(TF poly-Si)solar cells over a broad spectral range, and quantify the effectiveness of nanoshell light trapping structure over the full solar spectrum in theory,the effective photon trapping flux(EPTF)and effective photon trapping efficiency(EPTE)were firstly proposed by considering both the external quantum efficiency of TF poly-Si solar cell and scattering properties of light trapping *** EPTF,EPTE and scattering spectrum exhibit different behaviors depending on the geometric size and density of nanoshells that form the light trapping *** an optimum size and density of SiO2/Au nanoshell light trapping layer,the EPTE could reach up to 40%due to the enhancement of light trapping over a broad spectral range,especially from 500 to 800 nm.

关键词： thin film poly-crystalline silicon surface plasmons SiO2/Au nanoshell

Influence of oxygen gas content on the structural and optical properties of ZnO thin films deposited by RF magnetron sputtering at room temperature

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Rare Metals 2011年第2期30卷 170-174页

作者： LIU Baoting ZHOU Yang ZHENG Hongfang LI Mana GUO Zhe HAO Qingxun PENG Yingcai College of Physics Science and Technology Hebei University Baoding 071002 China Baoding University Baoding 071000 China College of Electronic and Information Engineering Hebei University Baoding 071002 China

Zinc oxide （ZnO） thin films were deposited on sapphire （0001） substrates at room temperature by radiofrequency （RF） magnetron sputtering at oxygen gas contents of 0%, 25%, 50% and 75%, respectively. The influence of oxygen gas content on the structural and optical properties of ZnO thin films was studied by a surface profile measuring system, X-ray diffraction analysis, atomic force microscopy, and UV spectro- photometry. It is found that the size of ZnO crystalline grains increases first and then decreases with the increase of oxygen gas content, and the maximum grain size locates at the 25% oxygen gas content. The crystalline quality and average optical transmittance （〉90%） in the visi- ble-light region of the ZnO film prepared at an oxygen gas content of 25% are better than those of ZnO films at the other contents. The obtained results can be attributed to the resputtefing by energetic oxygen anions in the growing process.

关键词： thin films zinc oxide magnetron sputtering oxygen structural properties optical properties

Induced electric fields and plasmonic interactions between a metallic nanotube and a thin metallic film

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Science china(Physics,Mechanics & Astronomy) 2010年第1期53卷 38-43页

作者： LI HongJian 1,2 , FU ShaoLi 1 , XIE SuXia 1,2 , XU HaiQing 1 , ZHOU Xin 1,2 & WU JinJun 1 1 College of Physics Science and Technology, Central South University, Changsha 410083, china 2 College of Materials Science and Engineering, Central South University, Changsha 410083, china College of Physics Science and Technology Central South University Changsha China College of Materials Science and Engineering Central South University Changsha China

We have numerically simulated the induced electric fields and the plasmonic interactions of a metallic nanotube near a thin metallic film. Our study shows that the energies and intensities of the plasmon resonances depend strongly on the aspect ratio (the ratio of the inner to outer radius) of the nanotube as well as the separation between the center of the nanotube and the upper surface of the metallic film and the thickness of the film. The enhancement of the induced electric field of this system reaches as high as 10 4 orders of magnitude and its field distribution is characterized by waveguide-mode resonance. The report proposes that these phenomena can be applied to designing surface enhanced spectroscopies such as surface enhanced Raman spectroscopy for efficient chemical and biological sensing.

关键词： metallic nanotube virtual state plasmons extinction spectrum