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Atomic configuration in core structure of Lomer dislocation in Si0.76Ge0.2./Si

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Atomic configuration in core structure of Lomer dislocation ...

CCAST“先进高分辨电子显微学—理论和应用”研讨会

作者： D. Wang, H. Chen, F. H. Li, K. Kawasaki and T. Oikawa institute of Physics & center for {2. matter Physics, chinese academy of sciences, P.O. Box 603, beijing 100080 JEOL-LTD,1-2.Musashino 3-chome, Akishima, Tokyo 196

＜正＞ The core structure of a Lomer dislocation in SiGe/Si system has been revealed at atomic level. This is attained by applying the image deconvolution technique in combination with dynamical diffraction effect correction to the high-resolution image taken with a 2.0 kV field-emission gun high-resolution electron microscope. The Lomer dislocation has a Homstra-like core. The contrast of the image simulated on the basis of derived atomic configuration is in agreement with that of the experimental image.

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Dependence of the solar cell performance on nanocarbon/Si heterojunctions

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chinese Physics B 2018年第7期27卷 595-600页

作者：肖仕奇范庆霞夏晓刚肖卓建陈辉亮席薇陈鹏辉李俊杰王艳春刘华平周维亚 beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences University of chinese academy of sciences beijing Key Laboratory for Advanced Functional Materials and Structure Research

Solar cells that combine single-crystalline silicon （Si） with graphene （G） have been widely researched in order to develop next-generation photovoltaic devices. However, the power conversion efficiency （PCE） of G/Si solar cell without chemical doping is commonly low due to the relatively high resistance of graphene. In this work, through combining graphene with carbon nanotube （CNT） networks, we fabricated three kinds of hybrid nanocarbon film/Si heterojunction solar cells in order to increase the PCE of the graphene based Si solar cell. We investigated the characteristics of different nanocarbon film/Si solar cells and found that their performance depends on the heterojunctions. Specifically, a doping-free G-CNT/Si solar cell demonstrated a high PCE of 7.9%, which is nearly equal to the combined value of two individuals （G/Si and CNT/Si）. This high efficiency is attributed to the synergistic effect of graphene and CNTs, and can be further increased to 9.1% after applying a PMMA antireflection coating. This study provides a potential way to further improve the Si based heterojunction solar cells.

关键词： carbon nanotube graphene heterojunction silicon solar cell

The p,p’-dimercaptoazobenzene produced from 4-aminothiophenol in Cu sol by surface photochemistry reaction

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The p,p’-dimercaptoazobenzene produced from 4-aminothiophen...

第十六届全国光散射学术会议

作者： M.T.Sun (beijing National Laboratory for condensed {2. Physics,institute of Physics,chinese academy of sciences,P.O.Box 603-146,beijing,100190,P.R.china

＜正＞The experimental and theoretical evidence has been provided that the p,p’-dimercaptoazobenzene is produced from 4-aminothiophenol in Cu sol by surface photochemistry *** firstly measured the normal Raman spectroscopy of 4-aminothiophenol,then measured the surface enhanced Raman scattering spectrum of 4-aminothiophenol in Cu *** experimental SERS spectrum reveals that the p,p’-dimercaptoazobenzene is produced from 4-aminothiophenol in Cu sol by surface photochemistry reaction.

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乌兰布和沙区绿洲农田土壤微生物及酶活性研究

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水土保持学报 2011年第5期25卷 121-125,129页

作者：包耀贤徐明岗辛智鸣孙非徐军中国农业科学院农业资源与农业区划研究所北京100081 中国林业科学研究院沙漠林业实验中心内蒙古磴口015200

以撂荒地为对照,通过测定0-2.cm和2.-40cm层次土样,利用统计分析方法系统研究乌兰布和沙区籽瓜、玉米、油葵和苜蓿地4种绿洲农田土壤微生物(细菌、放线菌和真菌)和土壤酶活性(蔗糖酶、脲酶、过氧化氢酶、碱性磷酸酶、蛋白酶和多酚氧化酶... 详细信息

以撂荒地为对照,通过测定0-2.cm和2.-40cm层次土样,利用统计分析方法系统研究乌兰布和沙区籽瓜、玉米、油葵和苜蓿地4种绿洲农田土壤微生物(细菌、放线菌和真菌)和土壤酶活性(蔗糖酶、脲酶、过氧化氢酶、碱性磷酸酶、蛋白酶和多酚氧化酶)特征。结果表明:(1)各农田微生物数量均为细菌(107)>放线菌(105)>真菌(103),三者中,细菌数量占三大类微生物总数的99%以上;各农田表层微生物数量整体高于对照的,且表层均高于下层,但差异不显著;农田间,籽瓜地微生物数量最多;种植苜蓿可显著提升真菌数量。(2.6种酶活性中,仅蔗糖酶和脲酶在层次间和农田间存在显著差异;各农地表层蔗糖酶、脲酶、过氧化氢酶和蛋白酶活性均高于对照的;除多酚氧化酶外,苜蓿地酶活性整体较高。(3)各生物学性质相互关联,互相影响。6种酶间呈显著或极显著相关,酶活性既显专性又显共性;蔗糖酶、过氧化氢酶、脲酶、蛋白酶、多酚氧化酶、真菌和放线菌直接影响有机质含量的程度达85%;总体而言,乌兰布和沙区绿洲体系形成后,长期农作活动使得绿洲农田生物学性质得以改善,土壤质量整体有所提高;设法提高研究区土壤有机质含量是提高绿洲农田土壤质量和改善其生态环境的关键所在,应广种苜蓿。

关键词：乌兰布和沙区绿洲农田土壤微生物土壤酶活性

Structure and crystal growth of Li2.n2.MoO4)3

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Structure and crystal growth of Li2Zn2(MoO4)3

第14届全国晶体生长与材料学术会议

作者： Liping Xuea, Zhang Lina, Feng Huanga,*, Jingkui Lianga,b,c aState Key Laboratory of Structural Chemistry, Fujian institute of Research on the Structure of matter,{2., Fuzhou, Fujian, 350002. People’s Republic of china binstitute of Physics and center for condensed matter Physics ,{2. , beijing 100080, People’s Republic of china cInternational center for Materials Physics, Academia Sinica , Shengyang 110015, People’s Republic of china

The compound Li2.n2.(MoO4)3 is isostructural to Li2.o2.(MoO4)3 and is refined by the Rietveld method [1]. It belongs to an orthorhombic system with space group Pnma and lattice constants a = 5.1114?,

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Gas pressure dependence of composition in Ta-Ti-N films prepared by pulsed high energy density plasma

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Gas pressure dependence of composition in Ta-Ti-N films prep...

第18届国际真空大会

作者： W. R. Zeng a * H. Zhou F. Chen S. Z. Yang b a Department of Materials Science & Engineering beijing institute of Petrochemical Technology beijing 102.17 china b beijing National Laboratory for condensed matter Physics institute of Physics chinese academy of sciences beijing {12. china

Tantalum titanium nitride （Ta-Ti-N） films were deposited on silicon wafer substrates by pulsed high energy density plasma （PHEDP）, under different intake gas pressure, ranging from 0.1 to 0.4 MPa. The films were investigated by X-ray photoelectron spectroscopy. Results were analyzed in detail, which reveals that the contents of the metallic elements （Ta and Ti） tend to decrease with pressure, while that of nitrogen increases as expected. The bonding state of tantalum, titanium, as well as nitrogen was discussed. It seems that almost all the titanium bonded with nitrogen. The Ta-N and Ti-N bonds have equal shares under low gas intake pressure, while the Ti-N bonds prevail under high pressure. The mechanisms change under different conditions.

关键词： Plasma PHEDP Tantalum titanium nitride Films XPS

The Ge Critical Nuclei on Si(111)-(7×7)Surface at Room Temperature

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The Ge Critical Nuclei on Si(111)-(7×7)Surface at Room Temp...

2.01年纳米和表面科学与技术全国会议

作者： Long Yan, Yongping Zhang, Yiping Peng, Hongjun Gao, Sishen Xie and Shijin Pang beijing Laboratory of Vacuum Physics, institute of Physics & {2. for condensed matter Physics, chinese academy of sciences, P.O. Box 2.2., beijing 100080, P. R. china

The initial stage of Ge adsorption on Si(111)7 ×7 surface has been investigated by ultra-high vacuum scanning tunneling microscopy (UHV-STM) at room temperature. We found that not only adsorbed Ge atoms on the Si(111)-(7×7) surface can nucleate into clusters at room temperature but also there a critical nucleus for the clusters. The

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Monolithic CEO-stabilization scheme-based frequency comb from an octave-spanning laser

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chinese Physics B 2016年第4期25卷 150-153页

作者：于子蛟韩海年谢阳滕浩王兆华魏志义 beijing National Laboratory for condensed {2. Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physics and Optoelectronics Engineering Xidian UniversityXi'an 710071China

We demonstrate a carder-envelope phase-stabilized octave-spanning oscillator based on the monolithic scheme. A wide output spectrum extending from 480 nm to 1050 nm was generated directly from an all-chirped mirror Ti：sapphire laser. After several improvements, the carder-envelope offset （CEO） beat frequency accessed nearly 60 dB under a reso- lution of 100 kHz. Using a feedback system with 50-kHz bandwidth, we compressed the residual phase noise to 55 mrad （integrated from 1 Hz to 1 MHz） for the stabilized CEO, corresponding to 2.-as timing jitter at the central wavelength of 790 nm. This is, to the best of our knowledge, the smallest timing jitter achieved among the existing octave-spanning laser based frequency combs.

关键词： octave-spanning laser optical frequency comb carrier-envelope offset low phase noise

Growth of a new novel borate crystal LiSr4B3O9

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Growth of a new novel borate crystal LiSr4B3O9

第14届全国晶体生长与材料学术会议

作者： Jun Liu, X. L. Chen*, M. He beijing National Laboratory for condensed {2. Physics, institute of Physics, chinese academy of sciences P.O. Box 603, beijing 100080, People’s Republic of china

New transparent borate single crystals LiSr4B3O9 were successfully grown by modified floating zone method in which a metal strip is immersed in the melt zone1, 2. and this crystal is obtained for the

关键词： modified floating zone method borate crystals LiSr4B3O9 laser application.