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59.1:Invited Paper: LTPS Backplane Technologies for AMLCDs and AMOLEDs

SID Symposium Digest of Technical Papers 2012年第1期42卷

作者： Chi Woo Kim Jin Goo Jung Jae Beom Choi Deok Hui Kim Chung Yi Hye Dong Kim Yun Ho Choi James Im Process Development Team 1 Samsung Mobile Display Co. Ltd. Cheonan-City Chungcheongnam-Do Process Development Team 2 Samsung Mobile Display Co. Ltd. Giheung-Gu Yongin-City Gyeonggi-Do Korea Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

In this paper, we review various LTPS backplane technologies based on laser-crystallization and other related methods that have been applied to AMLCD and AMOLED displays. The TFT performances obtained by different melt-mediated crystallization methods with excimer laser and solid phase crystallization will be compared. The technical issues of the image quality and the resolution will be discussed.

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Liquid Crystals: Mesomorphic Organization and Thermochromic Luminescence of Dicyanodistyrylbenzene‐Based Phasmidic Molecular Disks: Uniaxially Aligned Hexagonal Columnar Liquid Crystals at Room Temperature with Enhanced Fluorescence Emission and Semiconductivity (Adv. Funct. Mater. 1/2012)

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Advanced Functional materials 2012年第1期22卷

作者： Seong‐Jun Yoon Jong H. Kim Kil Suk Kim Jong Won Chung Benoît Heinrich Fabrice Mathevet Pyosang Kim Bertrand Donnio André‐Jean Attias Dongho Kim Soo Young Park Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program Department of Materials Science and Engineering Seoul National University ENG 445 Seoul 151‐744 Korea Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) UMR 7504 CNRS‐Université de Strasbourg 67034 Strasbourg Cedex 2 France Spectroscopy Laboratory for Functional π‐Electronic Systems and Department of Chemistry Yonsei University Seoul 120‐749 Korea Laboratoire de Chimie des Polymères‐UMR 7610 Université Pierre et Marie Curie 75252 Paris Cedex 5 France

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Metamorphic solar cells employing chemical mechanical polishing and MOVPE regrowth

Metamorphic solar cells employing chemical mechanical polish...

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2011 37th IEEE Photovoltaic Specialists Conference

作者： L. J. Mawst P. Dudley J. Kirch T. Kim S. Ruder T. F. Kuech R. Tatavarti Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI USA Materials Science Program University of Wisconsin-Madison Madison WI USA Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI USA Microlink Devices Inc. Niles IL USA

We have investigated the MOVPE growth of In x Ga 1-x As metamorphic buffer layer (MBL) structures with a focus on techniques to improve the surface morphology and determine the influence of morphology on subsequently grown single-junction device structures. To improve the surface roughness of the underlying MBL, Chemical-Mechanical Polishing (CMP) is employed and MOVPE regrowth of single-junction (SJ) solar cells on top of the polished surface is performed. AFM image analysis indicates the CMP process is effective in reducing the step-graded In x Ga 1-x As MBL surface roughness from ~7-10 nm (as-grown) to 2.3 nm post CMP. A post-CMP ozone/HF treatment was found to be effective in removing silica residue remaining on the surface from the CMP process, allowing for the growth of films on top of the MBL surface subjected to CMP. Improved short circuit current density (J sc ) and external quantum efficiency (QE) were obtained from SJ (1eV) devices which employ the CMP process compared with those on as-grown MBLs.

关键词： Surface roughness Rough surfaces Surface treatment Surface morphology Indium gallium arsenide Epitaxial layers Epitaxial growth

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Development of continuous wrapping tantalum barriers for internal-tin Nb3Sn multi-filamentary wires

Development of continuous wrapping tantalum barriers for int...

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Wu Ming Chen Mustafa Yavuz Xue Kui Fu Shiro Kambe Peter McIntyre Jian Xun Jin Waterloo Institute for Nanotechnology University of Waterloo Waterloo ONT Canada School of Materials Science & Engineering University of New South Wales Sydney NSW Australia Human Sensing Program Graduate School of Science and Engineering Yamagata University Yonezawa Japan Waterloo Institute for Nanotechnology University of Waterloo Cankaya University Ankara ON Turkey Department of Physics Texas A&M University TX USA Center of Applied Superconductivity and Electrical Engineering University of Electronic Science and Technology of China China

A process, continuous wrapping tantalum barrier, has been developed and investigated in order to reduce the manufacturing cost. By avoiding inserting expensive tantalum tube, a long sheet barrier was directly used to wrap a prior restack. In this work, a tantalum barrier with 20 % overlap was wrapped onto sub-elements. Then 18-filament Nb 3 Sn plus 1 copper core restack billet was successfully drawn down and extruded into round wire as thin as a diameter of 0.84 mm. The longitudinal and cross-sectional images revealed most of barriers were continuous and intact. However, further experiments are needed to optimize the process in order to keep the all barriers continuous and intact after manufacturing.

关键词： Niobium-tin Wires Copper Electron tubes Educational institutions Superconducting magnets

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Green and Highly Efficient Functionalization of Carbon Nanotubes by Combination of 1,3-Dipolar Cycloaddition and Curtius Rearrangement Reactions

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中国化学(英文版) 2010年第7期28卷 1223-1228页

作者： Peng Hongdan Yang Zhe Huang Shu Liu Tianxi Key Laboratory of Molecular Engineering of Polymers of Ministry of Education Department of Macromolecular Science Laboratory of Advanced Materials Fudan University Shanghai 200433 China

A facile and environmentally friendly strategy was developed for covalent modification of the convex surfaces of carbon nanotubes (CNT) through a combination of 1,3-dipolar cycloaddition of azomethine ylides and Curtius rearrangement of carboxylic acid azides and its application in grafting polyamide 6 onto the surface of CNT was further investigated.

关键词： carbon nanotube Curtius rearrangement green chemistry cycloaddition

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Heterologous expression, purification and characterization of nitrilase from Aspergillus niger K10

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BMC Biotechnology 2011年第1期11卷 1-15页

作者： Kaplan, Ondřej Bezouška, Karel Plíhal, Ondřej Ettrich, Rüdiger Kulik, Natallia Vaněk, Ondřej Kavan, Daniel Benada, Oldřich Malandra, Anna Šveda, Ondřej Veselá, Alicja B. Rinágelová, Anna Slámová, Kristýna Cantarella, Maria Felsberg, Jürgen Dušková, Jarmila Dohnálek, Jan Kotik, Michael Křen, Vladimír Martínková, Ludmila Institute of Microbiology Academy of Sciences of the Czech Republic Vídeňská 1083 CZ-142 20 Prague Czech Republic Department of Biochemistry Faculty of Science Charles University in Prague Hlavova 8 CZ-128 40 Prague Czech Republic Centre of Biocatalysis and Biotransformation Institute of Systems Biology and Ecology Academy of Sciences of the Czech Republic Zámek 136 373 33 Nové Hrady Czech Republic Department of Chemistry Chemical Engineering and Materials University of L'Aquila Via Campo di Pile - Zona industriale di Pile I-67100 L'Aquila Italy Institute of Macromolecular Chemistry Academy of Sciences of the Czech Republic Heyrovského náměstí 2 CZ-162 06 Prague Czech Republic

Background: Nitrilases attract increasing attention due to their utility in the mild hydrolysis of nitriles. According to activity and gene screening, filamentous fungi are a rich source of nitrilases distinct in evolution from their widely examined bacterial counterparts. However, fungal nitrilases have been less explored than the bacterial ones. Nitrilases are typically heterogeneous in their quaternary structures, forming short spirals and extended filaments, these features making their structural studies ***: A nitrilase gene was amplified by PCR from the cDNA library of Aspergillus niger K10. The PCR product was ligated into expression vectors pET-30(+) and pRSET B to construct plasmids pOK101 and pOK102, respectively. The recombinant nitrilase (Nit-ANigRec) expressed in Escherichia coli BL21-Gold(DE3)(pOK101/pTf16) was purified with an about 2-fold increase in specific activity and 35% yield. The apparent subunit size was 42.7 kDa, which is approx. 4 kDa higher than that of the enzyme isolated from the native organism (Nit-ANigWT), indicating post-translational cleavage in the enzyme's native environment. Mass spectrometry analysis showed that a C-terminal peptide (Val327 - Asn356) was present in Nit-ANigRec but missing in Nit-ANigWT and Asp298-Val313 peptide was shortened to Asp298-Arg310 in Nit-ANigWT. The latter enzyme was thus truncated by 46 amino acids. Enzymes Nit-ANigRec and Nit-ANigWT differed in substrate specificity, acid/amide ratio, reaction optima and stability. Refolded recombinant enzyme stored for one month at 4°C was fractionated by gel filtration, and fractions were examined by electron microscopy. The late fractions were further analyzed by analytical centrifugation and dynamic light scattering, and shown to consist of a rather homogeneous protein species composed of 12-16 subunits. This hypothesis was consistent with electron microscopy and our modelling of the multimeric nitrilase, which supports an arrangement of dimers int

关键词： Electron microscopy

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Invited paper: LTPS backplane technologies for AMLCDs and AMOLEDs

Invited paper: LTPS backplane technologies for AMLCDs and AM...

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49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011

作者： Kim, Chi Woo Jung, Jin Goo Choi, Jae Beom Kim, Deok Hui Yi, Chung Kim, Hye Dong Choi, Yun Ho Im, James Process Development Team 1 Samsung Mobile Display Co. Ltd. Cheonan-City Chungcheongnam-Do Korea Republic of Process Development Team 2 Samsung Mobile Display Co. Ltd. Giheung-Gu Yongin-City Gyeonggi-Do Korea Republic of Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY United States

ISBN: (纸本)9781618390967

关键词： Excimer lasers

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SQUARAINE DONORS FOR HIGH EFFICIENCY SMALL MOLECULE SOLAR CELLS

SQUARAINE DONORS FOR HIGH EFFICIENCY SMALL MOLECULE SOLAR CE...

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IEEE Photovoltaic Specialists Conference

作者： Guodan Wei Siyi Wang Xin Xiao C. Kyle Renshaw Lincoln Hall Vyacheslav V. Diev Mark E. Thompson Stephen R. Forrest Department of Materials Science and Engineering University of Michigan Department of Chemistry University of Southern California Department of Electrical Engineering and Computer Science University of Michigan Applied Physics Program University of Michigan

ISBN: (纸本)9781424499663

It has been a challenge to achieve high efficiency organic photovoltaics (OPV) that absorb long wavelength solar radiation without incurring unacceptable reductions in open circuit voltage (V_(oc)) or charge separation efficiency. Based on the parent structure of the 2, 4-bis[4-(N, N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ), we have increased V_(oc) using a family of highly near-infrared absorbing SQs, achieving values as high as 0.94 V. These SQ donors are: 2, 4-bis[4-(N-Phenyl-1-naphthylamino)-2,6-dihydroxyphenyl] squaraine (1-NPSQ),2,4-bis[4-(N,N-diphenylamino)-2,6 dihydroxyphenyl] squaraine (DPSQ), 2,4-bis[4-(N,N-diphenylamino)-2,6-dihydroxyphenyl] asymmetric squaraine (DPASQ). The spin-cast SQ, 1-NPSQ, DPSQ and DPASQ donors are then coated with the acceptor C_(60) to form bulk heterojunction (BHJ) solar cells that take advantage of their exceptionally high absorption coefficient and nanocrystalline morphology to overcome the short diffusion length characteristic of these materials. Combined with a high short-circuit current density (J_(sc)=10.6 mA/cm~2) and high fill factor (FF=0.64), the optimized 1-NPSQ/C_(60) photovoltaic cells with 1-NPSQ annealed at elevated temperature have a power conversion efficiency of η_p as high as 6.0% (correcting for solar mismatch) at 1 sun (AM 1.5G) simulated solar illumination, which to our knowledge is the highest efficiency reported to date for small molecule OPVs.

关键词： Photovoltaic cells Absorption Annealing Educational institutions Sun USA Councils Heterojunctions

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Phonon Transport and Thermoelectricity in Defect-Engineered InAs Nanowires

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MRS Online Proceedings Library 2011年第1期1404卷 36-43页

作者： Weathers, Annie Moore, Arden L. Pettes, Michael T. Salta, Daniel Kim, Jaehyun Dick, Kimberly Samuelson, Lars Linke, Heiner Caroff, Philippe Shi, Li Department of Mechanical Engineering The University of Texas at Austin Austin USA Center for Nano and Molecular Science The University of Texas at Austin Austin USA Material Science and Engineering Graduate Program The University of Texas at Austin Austin USA The Nanometer Structure Consortium (nmC@LU) and Division of Solid State Physics Lund University Lund Sweden Polymer & Materials Chemistry Lund Sweden Institut d’Electronique de Microelectronique et de Nanotechnologie UMR CNRS 8520 France

There have been reports of improvements in the thermoelectric figure of merit through the use of nanostructured materials to suppress the lattice thermal conductivity. Here, we report on a fundamental study of the combined effects of defect planes and surface scattering on phonon transport and thermoelectric properties of defect-engineered InAs nanowires. A microfabricated device is employed to measure the thermal conductivity and thermopower of individual suspended indium arsenide nanowires grown by metal organic vapor phase epitaxy. The four-probe measurement device consists of platinum resistance thermometers and electrodes patterned on two adjacent SiNx membranes. A nanowire was suspended between the two membranes, and electrical contact between the nanowire and the platinum electrodes was made with the evaporation of a Ni/Pd film through a shadow mask. The exposed back side of the device substrate allows for characterization of the crystal structure of the suspended nanowire with transmission electron microscopy (TEM) following measurement. The 100-200 nm diameter zincblende (ZB) InAs nanowire samples were grown with randomly spaced twin defects, stacking faults, or phases boundaries perpendicular to the nanowire growth direction, as revealed by transmission electron microscopy (TEM) analysis. Compared to single-crystal ZB InAs nanowires with a similar lateral dimension, the thermal conductivity of the defect-engineered nanowires is reduced by fifty percent at room temperature.

关键词： thermoelectric nanostructure thermal conductivity

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Impact of an Irreversibly Adsorbed Layer on Local Viscosity of Nanoconfined Polymer Melts

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Physical Review Letters 2011年第22期107卷 225901-225901页

作者： Tadanori Koga N. Jiang P. Gin M. K. Endoh S. Narayanan L. B. Lurio S. K. Sinha Chemical and Molecular Engineering Program Stony Brook University Stony Brook New York 11794-2275 USA Department of Materials Science & Engineering Stony Brook University Stony Brook New York 11794-2275 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Department of Physics Northern Illinois University DeKalb Illinois 60115 USA Department of Physics University of California San Diego La Jolla California 92093 USA

We report the origin of the effect of nanoscale confinement on the local viscosity of entangled polystyrene (PS) films at temperatures far above the glass transition temperature. By using marker x-ray photon correlation spectroscopy with gold nanoparticles embedded in the PS films prepared on solid substrates, we have determined the local viscosity as a function of the distance from the polymer-substrate interface. The results show the impact of a very thin adsorbed layer (∼7 nm in thickness) even without specific interactions of the polymer with the substrate, overcoming the effect of a surface mobile layer at the air-polymer interface and thereby resulting in a significant increase in the local viscosity as approaching the substrate interface.

关键词： POLYSTYRENE VISCOSITY GLASS transition temperature SPECTRUM analysis NANOPARTICLES POLYMERS

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