Browsing by Issue Date, starting with "2018-12-07"

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Effects of end- on oriented polymer chains at the donor/ acceptor interface in organic solar cells
(2018-12-07)
Wang, Fanji
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Nakano, Kyohei
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Yoshida, Hiroyuki
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Hashimoto, Kazuhito
;
Segawa, Hiroshi
Molecular alignment at the interface between the electron donor and acceptor (D/A) materials in thin films may have a large effect on the charge generation process in organic solar cells (OSCs). In this study, the effects of the polymer chain orientations at the D/A interface were investigated in OSCs with planar heterojunction (PHJ) structures. Poly(3-alkylthiophene) films with edge-on (main chain parallel to the interface) and end-on (main chain vertical to the interface) orientations at the surface were used to construct PHJs with a fullerene derivative. Ultraviolet photoelectron spectroscopy and low-energy inverse photoelectron spectroscopy revealed that the difference in polarization energy through the charge-permanent quadrupole interaction causes a rigid energy shift of 0.5eV between the two orientations. The PHJ device with the end-on oriented polymer chains at the D/A interface showed a smaller photovoltage loss expected from the energy structure and a more efficient charge separation than the device with the edge-on oriented polymer chains. These improvements were attributed to charge delocalization along the end-on oriented polymer chains normal to the D/A interface, through which the effective binding energy of the charge pairs in the interfacial charge-transfer state was reduced. These results provide important information about molecular arrangements at the D/A interface that may enable further improvements in OSC performance.
Temperature-Controlled Thiation of alpha-Cyano-beta-Alkynyl Carbonyl Derivatives for De Novo Synthesis of 2-Aminothiophenes and Thieno[2,3-c]isothiazoles
(2018-12-07)
Kao, Tzu-Ting
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Peng, Bo-Kai
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Liang, Min-Chieh
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Lee, Chia-Jui
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Chen, I-Chia
Making use of temperature-controlled thiation as a key operation, a simple route to 2-aminothiophenes or thieno[2,3-c]isothiazoles has been newly developed wherein the 2-aminothiophene nucleus was formed through an initial formation of thioamide followed by a 5-exo-dig addition to the tethered alkyne; however, under harsher thermal conditions, excess sulfur-transferring reagents enabled further oxidative thiation to generate the corresponding thieno[2,3-c]isothiazoles.
李孟穎　甜點照亮的新人生
(2018-12-09)
李沛榆
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Department of Communication and Technology
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傳播與科技學系
從辦公室白領到開設甜點店，「創業」讓李孟穎的人生更精彩。
黃牛猖獗　演唱會搶票大作戰
(2018-12-09)
許可晴
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Department of Communication and Technology
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傳播與科技學系
每當有知名歌手開演唱會時，黃牛票的議題一定會被拿出來討論，究竟為何在演唱會的領域，黃牛票問題會這麼難解決呢？
閉目不只養神　還能養創意？
(2018-12-09)
郭玟妤
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Department of Communication and Technology
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傳播與科技學系
遇到百思不得其解的難題，若不是問題太深奧，或許是時候換個「方式」思考了。
蔡佳璇　特效化妝之路
(2018-12-09)
林芷懷
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Department of Communication and Technology
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傳播與科技學系
在特效化妝師蔡佳璇細膩的妝點下，無論駭人的屍體或是精緻的妝容都栩栩如生。
305期總編輯的話
(2018-12-09)
吳佳璘
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Department of Communication and Technology
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傳播與科技學系
本期為喀報305期，總計10篇文章。本期頭題為郭玟妤的〈閉目不只養神還能養創意？〉，揭開科技新知的寫作新紀元，全文筆調輕鬆不生硬！本期輪播小巧思，請點開總編輯的話。
完美的弧度
(2018-12-09)
許家芸
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Department of Communication and Technology
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傳播與科技學系
什麼才是人生中最完美的弧度？不用想太多，就笑一下吧！希望這首歌可以溫暖低落、不開心的你們，我永遠會在你們身邊，我的朋友。
照亮女孩的魔髮師　Ann
(2018-12-09)
黃齡萱
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Department of Communication and Technology
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傳播與科技學系
「我覺得髮型設計師是客人的光。」Ann一邊幫客人上髮捲，一邊說著，對她來說幫客人變漂亮就像給他們光一樣，照亮他們，帶領他們自信地面對人群。
廣設直飲台　生飲自來水？
(2018-12-09)
王允妍
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Department of Communication and Technology
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傳播與科技學系
台北自來水事業處在台北地區多處設置直飲台，讓民眾生飲自來水。但究竟台灣的自來水能不能喝？
媽媽的好滋味　越式涼拌粄條
(2018-12-09)
顏筱娟
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Department of Communication and Technology
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傳播與科技學系
媽媽在越南成長，遠嫁他鄉來到台灣。每當她懷念家鄉時，解鄉愁的其中一個辦法就是烹煮家鄉食物。越式涼拌粄條更是她常烹煮料理之一，輕鬆就能品嘗家鄉味。
張育榕　打造寵物友善城市
(2018-12-09)
黃俊軒
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Department of Communication and Technology
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傳播與科技學系
「你領養，我送畫」是張育榕近幾年幫助流浪狗所舉辦的活動，為什麼她要做一件沒有金錢回報的事呢？
外公的那點事兒
(2018-12-09)
梁書瑜
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Department of Communication and Technology
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傳播與科技學系
外公是一名退伍軍人，說話充滿朝氣、走路健步如飛，但在他那雙鷹眼底下，總流露著一股淡淡的孤獨。
Engineering surface lattice resonance of elliptical gold nanodisk array for enhanced strain sensing
(2018-12-10)
Chang, Kai-Hao
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Cheng, Jiunn-Shouh
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Lu, Tsan-Wen
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Lee, Po-Tsung
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光電工程學系
We demonstrate an elliptical gold nanodisk array (GNA) for engineering the spectral profile of surface lattice resonance (SLR). The nanodisk's shape has a great impact on SLR. A small linewidth of 20 mn at an aspect ratio of 1.17 and a large wavelength tuning of 64 nm within 4% strain via different orientations and polarizations is achieved experimentally. The enhanced wavelength response of 6.93 mu per 1% strain variation for elliptical GNA is 2.4 times better than that for general circular GNA. Furthermore, figure of merit of strain sensing for elliptical GNA approaches 5.7 times greater than that for circular GNA. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Atomic scale depletion region at one dimensional MoSe2-WSe2 heterointerface
(2018-12-10)
Chu, Yu-Hsun
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Wang, Li-Hong
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Lee, Shin-Ye
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Chen, Hou-Ju
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Yang, Po-Ya
Lateral heterojunctions based on two dimensional (2D) transition metal dichalcogenides (TMDCs) potentially realize monolayer devices exploiting 2D electronic structures and the functions introduced by the presence of 1D heterointerfaces. Electronic structures of a lateral MoSe2-WSe2 junction have been unveiled using scanning tunneling microscopy and spectroscopy. A smooth and narrow depletion region exists despite a defect-rich heterointerface deviating from the preferred zigzag orientations of the TMDC lattice. From the characteristics of the depletion region, a high carrier concentration and high internal electric fields are inferred, offering to benefit designs of lateral TMDC devices. Published by AIP Publishing.
A qualified plate theory for rigid rotation in postcritical nonlinear analysis
(2018-12-10)
Kuo, S. R.
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Yang, Judy P.
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Yang, Y. B.
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土木工程學系
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Department of Civil Engineering
A new, simple method is presented for deriving the instability potential of thin plates, based on the equilibrium conditions and constitutive law for incremental forces considering the geometric nonlinear effect. First, the equations of equilibrium are established for the plate at the last calculated C-1 and current deformed C-2 states, from which the equilibrium equations for the incremental forces at C-2 are derived. Then, the incremental forces are derived as the summation of two parts: (1) the part from the increase of the Cauchy stresses at C-1 to the 2nd Piola-Kirchhoff stresses at C-2, which are related to the strain increments and derivable from the linear constitutive; and (2) the part by the difference between the 2nd Piola-Kirchhoff and 1st Piola-Kirchhoff stresses, which are related to the cross-sectional forces at C-1 and rigid displacements. Based on the previous concept, the rigid body rule and coordinate indifference of tensor expressions, the constitutive law for incremental forces including the geometric nonlinear effect is derived. Further, by the variational principle, the following instability potentials are derived: delta U-GB caused by the balance conditions for initial forces, delta U-GC caused by the constitutive law for incremental forces, and delta U-GR caused by the rotation of boundary moments. Consequently, the total instability potential is presented for the plate in the virtual work form. The present approach is self-explanatory, which requires only simple integration operations. Moreover, the two essential conditions are satisfied: equilibrium conditions for incremental forces and rigid body rule. Numerical examples are presented to demonstrate the rationality of the present plate theory compared with the conventional one.
Modeling e-loyalty: a moderated-mediation model
(2018-12-10)
Lin, Chieh-Peng
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Chiu, Chou-Kang
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Liu, Chu-Mei
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Chen, Kuang-Jung
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Hsiao, Chieh-Yu
This work proposes a research model that elaborates upon the development of e-loyalty based on the signaling theory and attachment theory. In the model, e-loyalty is indirectly related to both visual appeal and an e-tailer's service reputation through the full mediation of trust and affection. At the same time, the relationships between trust and e-loyalty and between affection and e-loyalty are hypothetically moderated by an e-tailer's service reputation. The proposed hypotheses of this research were empirically tested using data from working professionals in high-tech firms in terms of online retailing. This study surveyed the same research participants at two different time points, one month apart, to verify the theoretical inferences. The empirical findings herein complement the previous literature by presenting how visual appeal and an e-tailer's service reputation simultaneously influence e-loyalty through various mediating and moderating mechanisms.
Modal analysis of metallic screen with finite conductivity perforated by array of subwavelength rectangular flared holes
(2018-12-10)
Kehn, Malcolm Ng Mou
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交大名義發表
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電機學院
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National Chiao Tung University
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College of Electrical and Computer Engineering
An array of flared rectangular holes pierced through a conducting screen is treated herein by a rigorous full-wave modal analysis using the moment method entailing Green's functions for rectangular cavities and planar multilayer structures in the spectral domain as well as classical Floquet theorem and the mode-matching technique. In this way, flared holes with arbitrary taper profile that may each even be composed of different dielectric sections and which perforated metal films that may be sandwiched between multiple layers of dielectric slabs on both sides is herein treated. The eclectic permutations of geometrical, structural, and material attributes thus afforded by this generic topology facilitate correspondingly diverse investigations that may prove pivotal to the success of future explorations in search for new breakthrough discoveries and innovations in the subject of extraordinary transmission through subwavelength hole arrays, to which the herein-analyzed configuration is central. Oblique angles of incidence for both principal polarizations and metal losses incurred by imperfect conducting screens are also investigated in this work, all constituting crucial aspects that may often be neglected. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Activation of Molecular Hydrogen by Arylcarbenes
(2018-12-12)
Mendez-Vega, Enrique
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Maehara, Mika
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Raut, Akshay Hemant
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Mieres-Perez, Joel
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Tsuge, Masashi
The hydrogenation reactions of diphenylcarbene 1, fluorenylidene 2, and dibenzocycloheptadienylidene 3 were investigated in solid H-2 and D-2 matrices and in H-2- and D-2-doped argon matrices at cryogenic temperatures. The reactivity of the carbenes towards H-2 increases in the order 1<3<2. Whereas 1 is stable in solid H-2, 2 and 3 react fast under the same conditions via quantum chemical tunneling. In D-2 both 1 and 3 are stable, whereas 2 slowly reacts. The different reactivity of the three carbenes is rationalized in terms of differing carbene stabilization energies.
Room-Temperature Ferroelectricity in Hexagonally Layered alpha-In2Se3 Nanoflakes down to the Monolayer Limit
(2018-12-12)
Xue, Fei
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Hu, Weijin
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Lee, Ko-Chun
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Lu, Li-Syuan
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Zhang, Junwei
2D ferroelectric material has emerged as an attractive building block for high density data storage nanodevices. Although monolayer van der Waals ferroelectrics have been theoretically predicted, a key experimental breakthrough for such calculations is still not realized. Here, hexagonally stacking alpha-In2Se3 nanoflake, a rarely studied van der Waals polymorph, is reported to exhibit out-of-plane (OOP) and in-plane (IP) ferroelectricity at room temperature. Ferroelectric multidomain states in a hexagonal alpha-In2Se3 nanoflake with uniform thickness can survive to 6 nm. Most strikingly, the electric-field-induced polarization switching and hysteresis loop are, respectively, observed down to the bilayer and monolayer (approximate to 1.2 nm) thicknesses, which designates it as the thinnest layered ferroelectric and verifies the corresponding theoretical calculation. In addition, two types of ferroelectric nanodevices employing the OOP and IP polarizations in 2H alpha-In2Se3 are developed, which are applicable for nonvolatile memories and heterostructure-based nanoelectronics/optoelectronics.