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Electronic transport properties of an (8,0) carbon/silicon-carbide nanotube heterojunction

Journal of Semiconductors 2009年第5期30卷 5-8页

作者：刘红霞张鹤鸣张志勇 Key Laboratory of the Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian University Institute of Information Science and Technology Northwest University

A two-probe system of the heterojunction formed by an （8, 0） carbon nanotube （CNT） and an （8, 0） silicon carbide nanotube （SiCNT） was established based on its optimized structure. By using a method combining nonequilibrium Green＇s function （NEGF） with density functional theory （DFF）, the transport properties of the het-erojunction were investigated. Our study reveals that the highest occupied molecular orbital （HOMO） has a higher electron density on the CNT section and the lowest unoccupied molecular orbital （LUMO） mainly concentrates on the interface and the SiCNT section. The positive and negative threshold voltages are ＋1.8 and -2.2 V, respectively.

关键词： carbon/silicon carbide nanotube heterojunction nonequilibrium Green＇s function transport properties

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Fabrication of 11-nm-Wide Silica-Like Lines Using X-Ray Diffraction Exposure

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中国物理快报（英文版） 2009年第8期26卷 271-273页

作者： ZHU Xiao-Li XIE Chang-Qing ZHANG Man-Hong LIU Ming CHEN Bao-Qin PAN Feng Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084 Key Laboratory of Nano-fabrication and Novel Devices Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijin Key Laboratory of Nano-fabrication and Novel Devices Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029 Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084

Fine silica-like lines with 11 nm width are successfully fabricated using x-ray Fresnel diffraction exposure. X-rays pass a mask of 175-nm-wide lines and 125-nm-wide spaces and form sharp peaks on a wafer coated with a layer of hydrogen silsesquioxane resist (HSQ). By precisely controlling the mask-wafer gap at 10 μm using the laser interferogram method, the fine structures are defined on HSQ. Experimental images are reproduced by a simulation using the one-dimensional beam propagation method. This lithographic technique presents a novel and convenient way to fabricate fine silica-like structures and devices in nano-optical and nanoelectronic applications.

关键词： No English keyword

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Radial boundary forces-modulated valence band structure of Ge (110) nanowire

Radial boundary forces-modulated valence band structure of G...

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2009 13th International Workshop on Computational Electronics, IWCE 2009

作者： Honghua, Xu Yuhui, He Yuning, Zhao Gang, Du Jinfeng, Kang Ruqi, Han Xiaoyan, Liu Chun, Fan Institute of Microelectronics Key Laboratory of Microelectronic Devices and Circuits Peking University Beijing China Computer Center of Peking University Beijing China

ISBN: (纸本)9781424439270

For the radial boundary force induced in the process, the strain energy distribution and strain tensor components in Ge (110) nanowire (NW) are calculated by finite element method. Based on the strain distribution, we compute valence band structures with different radial forces. As increasing force values, top valence subbands shift downwards. The influence on the corresponding effective masses and density of states are also investigated. ©2009 IEEE.

关键词： Nanowires

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Design and fabrication of surface acoustic wave delay line for surface acoustic wave chemical-agent sensors

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Journal of Vacuum Science and Technology B: microelectronics and Nanometer Structures 2009年第4期27卷 1821-1824页

作者： Zhao, Yigui Liu, Ming Li, Jingjing Niu, Jiebin Li, Dongmei Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China

This article presents a method for designing and fabricating a surface acoustic wave (SAW) delay line for chemical-agent sensors. To improve the frequency stability and detection sensitivity, the authors designed and fabricated a SAW dual delay line with electrode-width control/single-phase unidirectional transducer and single-mode selection capability. Electron-beam direct writing lithography, x-ray lithography, and metal lift-off are applied to the fabrication of a SAW delay line with a submicron feature size. The experimental results are approximately in agreement with the design goals. © 2009 American Vacuum Society.

关键词： Acoustic waves

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Investigation of thermally robust single-component resistive switching organic memory cell

Investigation of thermally robust single-component resistive...

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67th Device Research Conference, DRC 2009

作者： Kuang, Yongbian Huang, Ru Wu, Dake Tang, Yu Yu, Zhe Ma, Ying Zhang, Lijie Tang, Poren Gao, Dejin Wen, Yongqiang Song, Yanlin Key Laboratory of Microelectronic Devices and Circuits Institute of Microelectronics Peking University Beijing 100871 China Organic Solid Laboratory Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

ISBN: (纸本)9781424435289

A novel organic memory device based on titany 1 phthalocyanine (TiOPc) thin film sandwiched between Aluminum and indium tin oxide electrodes was reported. With a single-component organic material, the device can achieve good performance, such as a high on/off current ratio of 10 4, a large 4 V read voltage window, and good retention (14, 000s at 1 V stress). The organic memory cell can maintain bistable performance up to 525 K due to the thermal robustness of TiOPc, indicating the potential for hybrid integration with CMOS technology. The possible switching mechanis m is proposed and well fitted with experimental data. The results show that the interface is significant for the reversible switching phenomenon. Trap-filling space charge limited conduction (SCLC) with TiOPc charge confinement and electrochemical reaction at the interface inducing lower electron affinity can elucidate the switching behavior of the TiOPc memory cell. © 2009 IEEE.

关键词： Electron affinity

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Water-Controlled Synthesis of Low-Dimensional Molecular Crystals and the Fabrication of a New Water and Moisture Indicator

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Nano Research 2009年第11期2卷 857-864页

作者： Zhuoyu Ji Huanli Dong Ming Liu Wenping Hu Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

Arrays of low-dimensional molecular crystals of square columns(1-D)and nanolamellae(2-D)of Zn[TCNQ]_(2)(H_(2)O)_(2)with large areas(up to 1020 cm^(2))have been synthesized by controlled addition of water to Zn and *** on the ability to accurately control the reaction,a new moisture and water indicator has been *** simple method,the large areas of material prepared,the fine size tuning,and the typical semiconductor behavior of the resulting low-dimensional molecular materials promise applications in molecular electronics as well as *** system is an effective indicator for the detection of traces of water and moisture.

关键词： Molecular materials molecular crystals nanomaterials water indicator

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Zero skew clock synthesis in VLSI design

Zero skew clock synthesis in VLSI design

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Asia Pacific Conference on Postgraduate Research in microelectronics & Electronics (PrimeAsia)

作者： Guirong Wu Song Jia Yuan Wang Ganggang Zhang Key Laboratory of Microelectronics Devices and Circuits Institute of Microelectronics Peking University Beijing China

This paper proposes a ZSCTS methodology aiding in zero skew clock tree synthesis suitable to the mainstream industry clock tree synthesis (CTS) design flow. At the gate level, the original clock net is broken up into smaller partitions, and the clock buffers are inserted as pseudo clock sources to drive each portion. The automatic place and route (APR) tool may synthesize each clock subtree with better performance. The proposed methodology is applied to a chip level clock tree network and achieves good results.

关键词： Clocks Very large scale integration Decoding Energy consumption Pipelines Modems Production systems Degradation Accuracy Frequency

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An efficient clock tree synthesis method in physical design

An efficient clock tree synthesis method in physical design

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IEEE Conference on Electron devices and Solid-State circuits

作者： Guirong Wu Song Jia Yuan Wang Ganggang Zhang Key Laboratory of Microelectronics Devices and Circuits Institute of Microelectronics Peking University Beijing China

This paper proposes a method aiding in low clock skew applicable to the mainstream industry clock tree synthesis (CTS) design flow. The original clock root is partitioned into several pseudo clock sources at the gate level. The automatic place and route (APR) tool may synthesize the clock tree with better performance in clock skew because each pseudo clock source drives smaller number of fan out. The proposed method is applied to a chip level clock tree network and achieves good results.

关键词： Clocks Design methodology Frequency synchronization Image edge detection Navigation Histograms Signal processing algorithms Frequency estimation Maximum likelihood detection Maximum likelihood estimation

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New noise-tolerant dynamic circuit design

New noise-tolerant dynamic circuit design

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IEEE Conference on Electron devices and Solid-State circuits

作者： Wei Su Song Jia Xiayu Li Limin Liu Yuan Wang Key Laboratory of Microelectronics Devices and Circuits (MOE) Department of Microelectronics Peking University Beijing China Key Laboratory of Microelectronics Devices and Circuits (MOE) Department of Microelectronics Peking University Beijing 100871 China

Dynamic circuit is suitable for high-speed application, but often suffers from noise related reliability problems which become increasingly prominent as the technology are entering into the scores of nano meter era. This paper presented a new dynamic circuit scheme, which could achieve higher noise margin without sacrificing much power consumption and delay time. This design achieves a higher noise margin (1.2 V) by finely tuning the transistor size. The effectiveness of new scheme is demonstrated in both NMOS series and parallel circuits. The simulation result shows that, compared with other published work, the proposed structure has the highest noise margin for the same power-delay product (PDP) 1 .

关键词： Circuit noise Circuit synthesis Crosstalk Working environment noise Noise reduction MOS devices Signal to noise ratio Energy consumption Dynamic voltage scaling microelectronics

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Sub-micrometer organic field effect transistors

Sub-micrometer organic field effect transistors

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ISTC/CSTIC 2009 (CISTC)

作者： Shang, L. Liu, M. Ji, Z. Liu, G. Liu, X. Liu, J. Wang, H. Key Laboratory of Nanofabrication and Novel Devices Integration Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China

ISBN: (纸本)9781615676460

Pentacene organic field effect transistors with a series of submicrometer channel have been fabricated and characterized. Source and drain metal electrodes was made by electron-beam lithography and lift-off process. Image reversal photo resist was used to make integrated mask to pattern the organic semiconductor film to reduce the off-state current. And thiol treatment was applied on gold electrodes to modify their surface energy and improve the charge carrier injection. All the devices can behavior as typical p-type transistor, and have obvious saturation. Using electrode and dielectric surface treatment, device performances have significant improvement. All of the performances, including mobility, threshold voltage and on/off current ratio will change with the channel length decreasing because of the low quality interface between the OSC and dielectrics. ©The Electrochemical Society.

关键词： Organic field effect transistors

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