Browsing by Issue Date, starting with "2008-01-14"

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Submicron-scale manipulation of phase separation in organic solar cells
(2008-01-14)
Chen, Fang-Chung
;
Lin, Yi-Kai
;
Ko, Chu-Jung
;
光電工程學系
;
顯示科技研究所
This paper describes a method for controlling the submicron-scale phase separation of poly(3-hexylthiophene) and (6,6)-phenyl-C(61)-butyric acid methyl ester in organic solar cells. Using microcontact printing of self-assembled monolayers on the device buffer layer to divide the surface into two regimes having different surface energies, an interdigitated structure aligned vertical to the substrate surface is achieved after spontaneous surface-directed phase separation. The power conversion efficiency increases upon decreasing the grating spacing, reaching 2.47%. The hole mobility increased as a consequence of improved polymer chain ordering, resulting in higher device efficiency, while smaller pattern sizes were used. (c) 2008 American Institute of Physics.
Modeling of nitrogen profile effects on direct tunneling probability in ultrathin nitrided oxides
(2008-01-14)
Liu, Po-Tsun
;
Huang, Chen-Shuo
;
Lee, D. Y.
;
Lim, P. S.
;
Lin, S. W.
The dependence of the gate tunneling current (J(g)) on nitrogen profile (N profile) within an ultrathin silicon oxynitride film is reported. It was found that gate tunneling current is dependent on N profile, even with equal oxide thickness and nitrogen dosage. Gate tunneling current increased with steeper N profile, and it had higher sensitivity for p-type metal-oxide-semiconductor field-effect transistor (MOSFET) than n-type MOSFET. A direct tunneling model based on Wentzel-Kramers-Brillouin approximation has been proposed. The model described the influence of N profiles on gate tunneling current through local change of dielectric constant, band bending, and effective mass. Also, it reasonably explained the different J(g) sensitivity in n-/p-MOSFETs, a phenomenon that has not been addressed in earlier publications. (c) 2008 American Institute of Physics.
Microstructure and recording mechanism of Bi-Fe-(N) layer for high-density write-once optical disk
(2008-01-14)
Mai, Hung-Chuan
;
Hsieh, Tsung-Eong
;
Jeng, Shiang-Yao
;
Chen, Chong-Ming
;
Wang, Jen-Long
Bi-Fe-(N) thin film as the recording layer of high density digital versatile disk recordable optical disk was developed. For the disk sample with optimized layer structure, maximum partial response signal to noise ratio of 21.1 and minimum simulated bit error rate of 5x10(-7) were achieved at the write power=5.7 mW. Transmission electron microscopy characterization illustrated that the separation of Bi and Fe elements to form the coarse granular structure in the mark regime during laser irradiation comprised of the recording mechanism. (c) 2008 American Institute of Physics.
Improvement of luminescence from Si nanocrystals with thermal annealing in CO2
(2008-01-15)
Yang, M. D.
;
Chu, A. H. M.
;
Shen, J. L.
;
Huang, Y. H.
;
Yang, T. N.
Photoluminescence (PL) of Si nanocrystals with annealing in CO2 was studied using the continuous and time-resolved PL measurements. The PL intensity enhances as annealing temperature increases, which is attributed to passivation of the nonradiative recombination centers. As the annealing temperature is 950 degrees C the PL intensity has a maximum value, which increases about a factor of 3 than that of the untreated sample. Based on the emission energy dependence of the PL decay time, the depth of carrier localization is found to increase after the annealing in CO2. We suggest that the oxygen atoms desorbed from CO2 diffuse to react with Si nanocrystals and introduce localized states at the Si/SiO2 interface. (C) 2007 Elsevier B.V. All rights reserved.
管管作品兩首
(2008-01-15)
管管
Indoor sound field feature matching for robot's location and orientation detection
(2008-01-15)
Hu, Jwu-Sheng
;
Liu, Wei-Han
;
Cheng, Chieh-Cheng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
In this work, an indoor sound field feature matching method is proposed and is applied to detect a mobile robot's location and orientation. The sound field feature, captured from a sound source to a pair of microphones, contains the dynamic of the propagation path. Because of the complexity of indoor environment, the features from different path can be distinguished using appropriate models. Gaussian mixture models are utilized in this paper to characterize the phase difference and magnitude ratio distributions between the microphone pair in consecutive data frames. The application provides an alternative thinking compared with traditional methods such as direction of arrival (DOA) using propagation delay. They usually suffer from reverberation, non-line-of-sight and microphone mismatch problems. The experimental results show the method not only has a high recognition rate for robot's location and orientation, but also is robust against environmental noise. (c) 2007 Elsevier B.V. All rights reserved.
Active 433 MHz-W UHF RF-powered chip integrated with a nanocomposite m-MWCNT/polypyrrole sensor for wireless monitoring of volatile anesthetic agent sevoflurane
(2008-01-15)
Chavali, Murthy
;
Lin, Tzu-Hsuan
;
Wu, Ren-Jang
;
Luk, Hsiang-Ning
;
Hung, Shih-Lin
Tiny remote sensors capable of monitoring gases and vapors are having greatest demand due to their potential applications in diverse research fields. In the present work, design and fabrication of an active wireless UHF (433 MHz) RF-powered sensing system for monitoring volatile organic compounds is presented. The developed sensor chip consists of a thin film of gas-responsive composite material, based on modified multiwalled carbon nanotubes (m-MWCNTs) and polypyrrole (Ppy), coated over two comb-like interdigitated gold electrodes. Wireless modules have been integrated with the chemical sensor chip (composite m-MWCNTs/Ppy) and RF components to detect volatile anesthetic agent, fluoromethyl 2,2,2,-trifluoro-1-(trifluoromethyl) ethyl ether (sevoflurane) is demonstrated. (c) 2007 Elsevier B.V. All rights reserved.
管管作品兩首
(2008-01-15)
管管
Novel reactive compatibilization strategy on immiscible polypropylene and polystyrene blend
(2008-01-15)
Hung, Chen-Jui
;
Chuang, Hung-Yang
;
Chang, Feng-Chih
;
應用化學系
;
Department of Applied Chemistry
Polypropylene (PP) and polystyrene (PS) are immiscible and incompatible. Since both PP and PS components possess no reactive functional group, reactive compatibilization of a PP/PS blend is impossible unless certain reactive functional groups are imparted to either PP or PS. In this study we provide a simple approach to reactively compatibilize the nonreactive PP/PS blend system by physically functionalizing PP and PS with the addition of maleic anhydride grafted PP (PP-g-MA) and styrene maleic anhydride random copolymer (SMA), respectively. An epoxy monomer, serving as a coupler and possessing four epoxy groups able to react with the maleic anhydride of PP-g-MA and SMA, was then added during melt blending. Observations of the finer PS domain sizes and improved mechanical properties support the plausibility of reactive compatibilization of this nonreactive PP/PS blend by combining physically functionalized PP and PS with tetra-glycidyl ether of diphenyl dian-Lino methane (TGDDM) in a one-step extrusion process. (C) 2007 Wiley Periodicals, Inc.
管管作品兩首
(2008-01-15)
管管
管管作品兩首
(2008-01-15)
管管
Nonlinear current-voltage characteristics of oxygen-deficient La(0.67)Ca(0.33)MnO(3-y) films
(2008-01-15)
Liu, S. J.
;
Juang, J. Y.
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Lin, J. -Y.
;
Wu, K. H.
;
Uen, T. M.
Two different types of nonlinear current-voltage characteristics are observed in oxygen-deficient La(0.67)Ca(0.33)MnO(3-y) (LCMO) films at temperatures below the insulator-metal transition. The paraboliclike dynamic conductance G(V), defined as dI/dV, curves near the zero bias observed in highly oxygen-deficient LCMO films implies the contribution from the spin-dependent tunneling transport between ferromagnetic clusters, with magnetic-disordered regions serving as tunneling barriers. On the other hand, for the slightly oxygen-deficient LCMO films, dips around the zero bias were observed in nonlinear G(V) curves and have been attributed to spin-flip scattering, with oxygen vacancies serving as scattering centers. (C) 2008 American Institute of Physics.
4-Port polarization-independent wavelength-interleaving bidirectional circulator
(2008-01-15)
Hsieh, Po-Jen
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Chen, Jing-Heng
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Hsieh, Hung-Chih
;
Jian, Zhi-Cheng
;
Su, Der-Chin
This study develops an alternative type of 4-port polarization-independent wavelength-interleaving bidirectional circulator. In this circulator the even- and odd-channels circulate with opposite handedness regardless of the state of polarization of signals. It has a pair of orthogonal holographic spatial- and polarization modules (HSPMs) and a Lyot-Ohman filter (LOF). Each HSPM has two holographic spatial walk-off polarizers (HSWPs), two glass plates and two half-wave plates. The function of the HSWJP is firstly described. Next, the structures and the operating principles of the HSPM and the LOF are also described. Then, the operating principle and the performance of this circulator are discussed. It has such merits as polarization-independence, compactness, high isolation, lack of polarization mode dispersion and ease of fabrication. (c) 2007 Elsevier B.V. All rights reserved.
管管作品兩首
(2008-01-15)
管管
A variables sampling plan based on C-pmk for product acceptance determination
(2008-01-16)
Wu, Chien-Wei
;
Pearn, W. L.
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工業工程與管理學系
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Department of Industrial Engineering and Management
Process capability indices are useful management tools, particularly in the manufacturing industry, which provide common quantitative measures on manufacturing capability and production quality. Most supplier certification manuals include a discussion of process capability analysis and describe the recommended procedure for computing a process capability index. Acceptance sampling plans have been one of the most practical tools used in classical quality control applications. It provides both vendors and buyers to reserve their own rights by compromising on a rule to judge a batch of products. Both sides may set their own safeguard line to protect their benefits. Two kinds of risks are balanced using a well-designed sampling plan. In this paper, we introduce a new variables sampling plan based on process capability index C-pmk to deal with product sentencing (acceptance determination). The proposed new sampling plan is developed based on the exact sampling distribution hence the decisions made are more accurate and reliable. For practical purpose, tables for the required sample sizes and the corresponding critical acceptance values for various producer's risk, the consumer's risk and the capability requirements acceptance quality level (AQL), and the lot tolerance percent defective (LTPD) are provided. A case study is also presented to illustrate how the proposed procedure can be constructed and applied to the real applications. (C) 2006 Elsevier B.V. All rights reserved.
Surface modified gold nanowires for mammalian cell transfection
(2008-01-16)
Kuo, Chiung-Wen
;
Lai, Jun-Jung
;
Wei, Kung Hwa
;
Chen, Peilin
;
材料科學與工程學系
Aminothiol modified gold nanowires have been used as vectors for the delivery of plasmid DNA into two different types of mammalian cells: 3T3 and HeLa. It was measured that positively charged gold nanowires with a diameter of 200 nm and a length around 5 mu m were capable of carrying 1 pg of plasmid DNA per nanowire into cells. Compared with other transfection reagents, the gold nanowires exhibited the highest transfection efficiency while almost no cytotoxicity was observed. In addition, it has been shown that individual nanowires can be visualized with sub-micrometer resolution, which may allow the use of functionalized multi-segment nanowires as local probes for the investigation of the microenvironment inside cells.
以結合半準位信號及多階層錯誤編碼的光碟防盜拷方法
(2008-01-16)
高銘盛
;
廖晨吟
;
葉人瑋
一種以結合半準位信號及多階層錯誤編碼的光碟防盜拷方法,本發明之方法是先於光碟設有加密鍵,再以設於光碟導入區之半準位信號及多階層錯誤編碼保護該加密鍵,使該加密鍵被正確解復之機率曲線產生明顯截止現象,達到防制盜拷之功效,而截止現象是依一定範圍之反射率而判斷。本發明係為一種低成本及防制各種方式盜拷之方法,並解決習用0位元與1位元被輕易複製的問題,且適用於一般播放器,不需複雜的配備及精密的檢測電路。
基板排序派工之方法
(2008-01-16)
巫木誠
;
陳德珊
本發明係揭露一種基板排序派工之方法,此方法包含提供卡匣配對關係、基板配對關係及排序機,並設置有輸入埠及輸出埠,且依據卡匣配對關係經演算法產生派工序列,將複數個第一卡匣依派工序列配送至輸入埠,且第一卡匣中的複數個第一基板,藉由排序機之機械手臂依基板配對關係移動與特定第二卡匣配對者至輸出埠,產出與第二卡匣內複數個第二基板完全配對的複數個第三卡匣,並將已配對的第二、第三卡匣送入壓合機進行壓合,藉此派工序列縮短第三卡匣產出時程,提昇壓合機之產能利用率。
Soluble phenanthrenyl imidazole for photo-electrical conversion of solar cell
(2008-01-17)
Wei, Kung-Hwa
;
Chang, Yao-Te
A novel material of phenanthrenyl imidazole is applied to a solar cell. A phenanthrenyl-imidazole moiety is introduced to reduce a power band of a polymer, so that a photocurrent and an optoelectrical transformation efficiency are improved. Thus, a polymer having the novel material is very suitable to be used in a solar cell to acquire a high optoelectrical transformation efficiency.
GaInP/GaAs HBT wideband transformer Gilbert downconverter with low voltage supply
(2008-01-17)
Tseng, S. -C.
;
Meng, C. C.
;
Wu, C. -K.
;
電信工程研究所
;
Institute of Communications Engineering
A low-voltage wideband downconverter along with an integrated transformer RF balun using the 2 mu m GaInP/GaAs HBT technology is demonstrated. This transformer is a symmetric type and plays a role as a single-to-differential balun. Without the parasitic between the transformer and the substrate, the transformer can work at higher frequencies. This transformer downconverter operates from 1.5 to 14 GHz with around 20 dB conversion gain and 1.8 GHz IF 3 dB bandwidth. The frequency range of the mixing operation is wide and covers the digital video broadcasting via satellite (DVB-S) bands. This mixer is therefore useful for DVB-S applications.