Browsing by Issue Date, starting with "2014-12-05"

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交大e-News第176期
(2014-12-05)
Secretariat
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國立交通大學秘書室
Control of metamorphic buffer structure and device performance of InxGa1-xAs epitaxial layers fabricated by metal organic chemical vapor deposition
(2014-12-05)
Nguyen, H. Q.
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Yu, H. W.
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Luc, Q. H.
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Tang, Y. Z.
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Phan, V. T. H.
Using a step-graded (SG) buffer structure via metal-organic chemical vapor deposition, we demonstrate a high suitability of In0.5Ga0.5As epitaxial layers on a GaAs substrate for electronic device application. Taking advantage of the technique\'s precise control, we were able to increase the number of SG layers to achieve a fairly low dislocation density (similar to 10(6)cm(-2)), while keeping each individual SG layer slightly exceeding the critical thickness (similar to 80 nm) for strain relaxation. This met the demanded but contradictory requirements, and even offered excellent scalability by lowering the whole buffer structure down to 2.3 mu m. This scalability overwhelmingly excels the forefront studies. The effects of the SG misfit strain on the crystal quality and surface morphology of In0.5Ga0.5As epitaxial layers were carefully investigated, and were correlated to threading dislocation (TD) blocking mechanisms. From microstructural analyses, TDs can be blocked effectively through self-annihilation reactions, or hindered randomly by misfit dislocation mechanisms. Growth conditions for avoiding phase separation were also explored and identified. The buffer-improved, high-quality In0.5Ga0.5As epitaxial layers enabled a high-performance, metal-oxide-semiconductor capacitor on a GaAs substrate. The devices displayed remarkable capacitance-voltage responses with small frequency dispersion. A promising interface trap density of 3 x 10(12) eV(-1) cm(-2) in a conductance test was also obtained. These electrical performances are competitive to those using lattice-coherent but pricey InGaAs/InP systems.
Scattering resonance enhanced dye absorption of dye sensitized solar cells at optimized hollow structure size
(2014-12-05)
Tsai, Min-Chiao
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Lee, Jeng-Yi
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Chang, Ya-Chen
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Yang, Min-Han
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Chen, Tin-Tin
This study elucidates the size effect on dye-sensitized solar cells (DSSCs) by synthesizing highly uniform hierarchical hollow sphere TiO2 samples, with the diameters from 220 nm to 800 nm. Experimental results indicate that the optimum conversion efficiency using N719 dye can be achieved around 5.5%, as the diameter of hierarchical hollow spheres is 450-550 nm. According to the incident photon-to-current conversion efficiency (IPCE) spectra, large-sized hierarchical hollow spheres significantly enhance the light harvesting by scattering; whereas small-sized hallow spheres (<360 nm) improve negligibly. Additionally, mesoporous and solid spheres with an identical diameter, 440 nm in this study, are also studied as a comparison. Our results demonstrate that hollow spheres perform the same conversion efficiency as that of mesoporous spheres owing to the equivalent adsorption of dye molecules in both hierarchical structures - regardless of the surface area of the interior of mesoporous structure, which shows that hollow spheres have higher conversion efficiency per unit volume than that of mesoporous spheres. (C) 2014 Elsevier B.V. All rights reserved.
Thermoelectric properties of nanostructured bismuth-telluride thin films grown using pulsed laser deposition
(2014-12-05)
Phuoc Huu Le
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Liao, Chien-Neng
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Luo, Chih Wei
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Leu, Jihperng
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交大名義發表
Nanostructured n-type bismuth telluride (Bi2Te3) thin films were grown on SiO2/Si (100) substrates at argon ambient pressure (P-Ar) of 80 Pa by pulsed laser deposition (PLD). The effects of film morphologies, structures, and compositions on the thermoelectric properties were investigated. At a substrate temperature (T-s) of 220-340 degrees C, stoichiometric films with highly (001)-oriented and layered structures showed the best properties, with a carrier mobility mu of 83.9-122.3 cm(2)/Vs, an absolute Seebeck coefficient vertical bar alpha vertical bar of 172.8-189.7 mu V/K, and a remarkably high power factor (PF) of 18.2-24.3 mu W cm(-1) K-2. By contrast, the Te-rich films deposited at T-s <= 120 degrees C with (015)-preferred orientations and columnar-small grain structures or the Te-deficient film deposited at 380 degrees C with Bi4Te5 polyhedron structure possessed poor properties, with mu < 10.0 cm(2)/Vs, vertical bar alpha vertical bar < 54 mu V/K, and PFs <= 0.44 mu W cm(-1) K-2. The morphology of highly (001) oriented-layered structures and the stoichiometry predominantly contribute to the substantial enhancement of mu and alpha vertical bar, respectively, resulting in remarkable enhancement in PF. (C) 2014 Elsevier B.V. All rights reserved.
象牙塔外　明星高中存廢戰
(2014-12-07)
陳怡均
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Department of Communication and Technology
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傳播與科技學系
針對十二年國教實行的現況、明星高中備受爭議的現勢以及大眾紛歧的觀點作探討，歸納出可行的未來發展。
關余膚色　我想說的事
(2014-12-07)
余念竹
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Department of Communication and Technology
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傳播與科技學系
活出自我「不留白」，小麥膚色的宣言。
性教育
(2014-12-07)
黃苡齊
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Department of Communication and Technology
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傳播與科技學系
那些年　爸爸與芭樂的回憶　
(2014-12-07)
陳亞柔
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Department of Communication and Technology
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傳播與科技學系
在阿爸生日那天，摳摳憶起爸爸與芭樂的故事。
恐怖情人　當深愛變成殺害
(2014-12-07)
黃馨儀
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Department of Communication and Technology
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傳播與科技學系
近年來，情殺案件頻傳的現象，來自於社交媒介轉換、媒體的連鎖效應及教育體制的根源，情感問題是大眾關注且必須學習的議題。
文字繪畫攝影　布列松之眼
(2014-12-07)
沈祖廷
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Department of Communication and Technology
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傳播與科技學系
紀載布列松一生精華文字，扼要道出布列松於新聞攝影的價值觀與性格。
變化自如　幕後的聲音演員
(2014-12-07)
張婷芳
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Department of Communication and Technology
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傳播與科技學系
資深配音員蔣篤慧，娓娓道來身為臺灣配音員的酸甜苦辣。
心情
(2014-12-07)
賴奕安
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Department of Communication and Technology
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傳播與科技學系
場場難忘　啦啦隊賽事
(2014-12-07)
賴奕安
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Department of Communication and Technology
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傳播與科技學系
我的啦啦隊人生是由無數次參與的賽事累積而成，場場都獨特、場場都難忘。
橫著走出一條路　現實搖滾
(2014-12-07)
李怡安
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Department of Communication and Technology
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傳播與科技學系
日本搖滾樂團RADWIMPS，以獨具的世界觀和特殊省思角度，溫柔但尖銳的唱出此生的生命態度。
多元創意　單一主題同人展
(2014-12-07)
簡品心
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Department of Communication and Technology
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傳播與科技學系
臺灣的同人誌販售活動日益興盛，更出現限定特定主題的「單類型同人誌販售會」，顯示同人活動的多樣面貌。
親子野餐趣　草地微旅行
(2014-12-07)
謝宜寧
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Department of Communication and Technology
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傳播與科技學系
二○一四年十二月六日，由一群七年級生組成的團隊發起的親子野餐會，在臺北大安森林公園登場。
重機街頭文化　磅礡展出
(2014-12-07)
吳建勳
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Department of Communication and Technology
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傳播與科技學系
由雜誌社所主辦的重型機車展「Ride Free 5」，在五股工商展覽館盛大展開，呈現具有速度和藝術感的騎士文化。
跑跳好心情　健康又紓壓
(2014-12-07)
陳珮容
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黃苡齊
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Department of Communication and Technology
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傳播與科技學系
董氏基金會在中正紀念堂舉辦跳繩活動，目的是為了提倡跳繩的好處，呼籲大家重視健康的重要性。
橙色的季節　唯美「柿」界
(2014-12-07)
陳思寧
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Department of Communication and Technology
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傳播與科技學系
新竹九降風吹起陣陣柿香，一片澄黃映入眼簾，那既是辛苦的結晶，也既是甜美的滋味。
夢想配方　攝影甜點與咖啡
(2014-12-07)
洪詩宸
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Department of Communication and Technology
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傳播與科技學系
天性熱愛自由的彭枝微，辭掉穩定的園區工作，結合攝影興趣勇敢逐夢開設咖啡廳。