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Metal Nanoparticle-Decorated Two-Dimensional Molybdenum Sulfide for Plasmonic-Enhanced Polymer Photovoltaic Devices
(2015-08-01)
Chuang, Ming-Kai
;
Yang, Shun-Shing
;
Chen, Fang-Chung
;
光電工程學系
;
Department of Photonics
Atomically thin two-dimensional (2D) transition metal dichalcogenides have also attracted immense interest because they exhibit appealing electronic, optical and mechanical properties. In this work, we prepared gold nanoparticle-decorated molybdenum sulfide (AuNP@MoS2) through a simple spontaneous redox reaction. Transmission electron microscopy, UV-Vis spectroscopy, and Raman spectroscopy were used to characterize the properties of the AuNP@MoS2 nanomaterials. Then we employed such nanocomposites as the cathode buffer layers of organic photovoltaic devices (OPVs) to trigger surface plasmonic resonance, leading to noticeable enhancements in overall device efficiencies. We attribute the primary origin of the improvement in device performance to local field enhancement induced by the effects of localized surface plasmonic resonance. Our results suggest that the metal nanoparticle-decorated two-dimensional materials appear to have great potential for use in high-performance OPVs.
有機光電流增益現象之探討與其在光偵測器的應用
(2010)
陳方中
;
Chen Fang-Chung
;
國立交通大學光電工程學系（所）
光偵測器的優點包含了可撓性，重量輕、容易攜帶，並且製程溫度低，可製作於可撓性塑膠基板上。我們已發現在高分子與富勒烯混合物中加入一個近紅外光的有機染料可達成高達8000%的光子增益現象，藉此製作的光偵測器初步的實驗結果已可達到非常高的光響應度(28 A/W)。「有機光電流增益現象之探討與其在光偵測器的應用」之研究計劃將系統性地研究此光子增益現象及對高分子光偵測器特性的影響。除了元件製作參數的最佳化之外，也將量測元件的動態特性，高分子薄膜型態也會以原子力顯微鏡、穿透式電子顯微鏡等方式研究，薄膜材料的深度剖面也將以穿透式電子顯微鏡及二次離子質譜儀探討，更重要的是，我們也擬仔細探討此特殊的光子增益機制，我們將量測電容電壓曲線以釐清電荷捕陷的可能性，也將製作電子及電洞元件藉以判斷電荷捕陷的狀態，我們也擬製作不同金屬電極的元件，並藉由量測其特性之差異幫助機制的理解。在計畫的第二年度，我們將以數種方式改善元件的效能與穩定度。包含製作電極緩衝層用以降低漏電流，並分析元件的內部光電場的分佈，並經電場的最佳化增加元件的光吸收，也擬藉由加入光學間隙層與金屬奈米粒子所誘導的表面電漿效應改善光子的吸收效率，最後，我們也將量測元件生命期，並藉由自發生成的電極緩衝層改善元件的穩定度。預計成功執行本計劃後高分子光偵測器的效率與元件生命期及穩定性都將被大幅改善。
使用多孔模板製作之高分子奈米材料及其應用
(2010)
陳俊太
;
Chen Jiun-Tai
;
國立交通大學應用化學系（所）
一維(one-dimensional)高分子奈米材料具有獨特的性質以及潛在的應用性，因此在近來引起來極大的興趣。然而相對其他方向而言，只有相對少的研究是關於如何製作一維的高分子奈米材料。在本計劃中，我們想要利用一個簡單的模板方法來研究不同高分子與高分子相關之奈米材料的製作與鑑定。在模板的使用上我們會使用陽極氧化鋁模板。這種模版可以直接買到也可以利用二次陽極氧化(second anodization)的方法來合成。均聚高分子(homopolymers) 與團聯式共聚高分子(block copolymers) 將會被引入到氧化鋁模板的奈米級孔洞之中而形成一維的高分子奈米材料。我們將會研究這些奈米材料由於侷限效應(confinement effect)而產生的形態與特性上的變化。這些製作出來的高分子奈米材料將可用於自組裝的結構基材(building blocks)以及需要較大表面積的材料的相關應用。
以高分子作為感應偶合電漿反應離子蝕刻側壁保護層以製作單晶矽懸浮微結構之快速製程平台研發
(2011)
徐文祥
;
HSU WENSYANG
;
國立交通大學機械工程學系（所）
Dewatering characteristics of algae-containing alum sludge
(1999-05-01)
Pan, JR
;
Huang, CP
;
Chuang, YC
;
Wu, CC
;
環境工程研究所
The presence of algae in source waters not only causes problems in the water treatment process, but also complicates the treatment and disposal of sludge. This has become a major concern in Taiwan because of the increasing eutrophication of water sources. The purpose of this study was to determine the effects of algae during aging process on the characteristics of potable water treatment residuals and investigate their conditioning in order to provide water treatment plants with guidelines for treating algae-containing sludge. In this study, we measured the bound water content and CST to evaluate the influence of algae and their exudates on sludge conditioning. The change in zeta potential was monitored during sludge aging. During the aging process up to 5 days, the surface charge of sludge became more negative and the dewaterability was enhanced by algal exudates. Microphotographs of the algae-containing sludge suggest that algae and their exudates cause the bio-flocculation phenomenon. (C) 1999 Elsevier Science B.V. All rights reserved.
Effect of the sensitizer on the properties of fully functionalized photorefractive epoxy polymers and their performance in the hologram image storage
(1999-06-01)
Chang, CJ
;
Whang, WT
;
Hsu, KY
;
Hsieh, ML
;
材料科學與工程學系
The 3-amino-9-ethyl carbazole (AEC)/Dispersed Orange 3 (DO3)/diglycidyl 1,2 cyclohexanedicarboxylate (DCD) main chain copolymers are synthesized and studied on their photorefractive (PR), photoconductive, and holographic characteristics. They are good hologram recording media because not only the stored hologram exhibits excellent fringe contrast with the resolution at about 20 mu m, but also the image can be stored, erased, and overwritten. The UV/Vis spectra shows that AEC segments may form charge transfer complexes with either DO3 segments or TNF sensitizers. By incorporating the sensitizer or increasing the charge transfer component concentration, the grating growth rate can be speeded up. Applying an electric field on the polymer film containing no sensitizer helps to elevate the grating growth speed, but it shows little influence on the grating growth speed of the films with sensitizers. More nonlinear optical (NLO) segments in the copolymer result in higher diffraction efficiency. The dark decay of the film depends on the dark conductivity. Incorporating sensitizers or more charge transport segments leads to more dark decay because of increasing dark conductivity. The dark decay of the PR properties at elevated temperature can also be evaluated by the thermal stimulated discharge current (TSDC) spectroscopy technique. (C) 1999 John Wiley & Sons, Inc.
The characterisation and finite-element analysis of a polymer under hot pressing
(2002)
Lin, CR
;
Chen, RH
;
Hung, C
;
機械工程學系
;
Department of Mechanical Engineering
Finite-element simulation of the hot pressing process has been performed using ABAQUS. The viscoelastic polymer (polymethyl methacrylate) used in this study has mechanical properties that depend on the temperature and working pressure. Based on the nonlinear viscoelastic model, the polymer material behaviour is simulated successfully with the data obtained from material tests. Simulation results conform to related experiments, indicating that the approach can accurately predict pressure distribution within a polymer hot pressing.
Polarized blue emission based on a side chain liquid crystalline polyacrylate containing bis-tolane side groups
(2002-03-01)
Chang, SW
;
Li, AK
;
Liao, CW
;
Hsu, CS
;
應用化學系
A novel side chain liquid crystalline (LC) polyacrylate (1P) containing highly conjugated bis-tolane side groups was synthesized and used for polymer light emitting diodes application. Polymer 1P shows a nematic phase at room temperature. It exhibits a UV absorption peak at 330 run and emits a blue light at 425 inn. Polyimide (PI), polyaniline (PA) and poly(3,4-diethylenedioxythiophene) (PEDOT) were used as alignment materials for polymer 1P. The photoluminescence dichroic ratios of 1P on rubbed PI, PA and PEDOT films are 10.4, 8.3 and 7.3, respectively. The electroluminescence dichroic ratio of IP aligned on a PEDOT film is 6.1.
Optical and electrical investigations of poly(p-phenylene vinylene)/silicon oxide and poly(p-phenylene vinylene)/titanium oxide nanocomposites
(2005-01-03)
Yang, SH
;
Nguyen, TP
;
Le Rendu, P
;
Hsu, CS
;
應用化學系
Composites made by incorporation of silicon oxide (SiO2) or titanium (TiO2) nanoparticles into poly(p-phenylene vinylene) (PPV) have been fabricated and their electrical and optical properties have been investigated. The UV-vis absorption and Raman spectra showed that SiO2 nanoparticles reduced the conjugation lengths of PPV chains, while TiO2 nanoparticles did not. In the case Of SiO2 nanoparticles, the reduction of conjugation length was more noticeable on increasing the oxide concentration or on decreasing the particle size. Fourier transform infrared (FT-IR) spectra showed that both types of nanoparticles also reduced the formation of carbonyl groups in PPV main chains. Current-voltage characteristics measured in the indium tin oxide (ITO)-composite-MgAg diodes exhibit different electrical behavior to the composites depending on the particle size and the nature of the used oxide. The composite-electrode contact morphology, the polymer-dielectric particle contact, and the change in the polymer chain length are the possible explanations for these changes in behavior of the diodes. (C) 2004 Elsevier B.V. All rights reserved.
Solution-Processed Nanocomposites Containing Molybdenum Oxide and Gold Nanoparticles as Anode Buffer Layers in Plasmonic-Enhanced Organic Photovoltaic Devices
(2013-12-11)
Tan, Kim-Shih
;
Chuang, Ming-Kai
;
Chen, Fang-Chung
;
Hsu, Chain-Shu
;
應用化學系
Solution-processed nanocomposites containing molybdenum oxide (MoO3) and gold nanoparticles (Au NPs) have been used as anode buffer layers in organic photovoltaic devices (OPVs). The resulting devices exhibit a remarkable enhancement in power conversion efficiency after Au NPs were incorporated into the device. Such enhancements can be attributed to the localized surface plasmon resonance induced by the metallic nanostructures. We have also found that the rate of exciton generation and the probability of exciton dissociation were increased. Furthermore, the devices made of the MoO3 buffer layer containing Au NPs exhibited superior stability. This work opens up the possibility of fabricating OPVs with both high efficiency and a prolonged lifetime.

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