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Author: search.filters.author.Chen, Fang-ChungSubject: search.filters.subject.plasmonic

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Now showing 1 - 6 of 6
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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.
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    Plasmonic-Enhanced Organic Photovoltaic Devices for Low-Power Light Applications
    (2018-05-01)
    Teng, Nai-Wei
    ;
    Yang, Shun-Shing
    ;
    Chen, Fang-Chung
    ;
    光電工程學系
    ;
    Department of Photonics
    In this study, we prepared plasmonic-enhanced organic photovoltaic (OPV) devices incorporating gold nanoparticles (Au NPs) for low-power lighting applications. Gold NP-decorated graphene oxides were incorporated into the hole-transporting and active layer layers of the OPVs to trigger plasmonic effects. After adding the Au NPs, the devices exhibited higher photocurrents and power conversion efficiencies (PCEs) under both 1-sun and low-level illumination conditions; PCE enhancement factors of greater than 20% were achieved. Most interestingly, the device enhancement factors were much higher under low-level lighting than they were under sunlight. We attribute the improvement in device efficiency to the localized surface plasmon resonance originating from the Au NPs.
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    Plasmonic Effects of Amphiphilic Gold Nanoparticles in Polymer Optoelectronic Devices
    (2016)
    Chuang, Ming-Kai
    ;
    Lin, Chun-Hao
    ;
    Chen, Fang-Chung
    ;
    光電工程學系
    ;
    Department of Photonics
    Amphiphilic gold nanoparticles have been synthesized and employed for improving the performance of polymer optoelectronics devices. Such nanocomposites could be readily incoporated into the buffer and/or photoactive layers, resulting in obvious enhancements in device efficiencies.
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    Efficient and stable polymer solar cells prepared using plasmonic graphene oxides as anode buffers
    (2015-08-01)
    Chen, Chung-Lei
    ;
    Chuang, Ming-Kai
    ;
    Chen, Chyong-Hua
    ;
    Chu, Chih-Wei
    ;
    Keshtov, Muchamed L.
    Gold nanoparticle-decorated graphene oxides (AuNP-GOs) have been incorporated into inverted organic photovoltaic devices (OPVs) as anode interlayers. The OPVs fabricated with AuNP-GOs exhibited significant improvement in both the short-circuit current and fill factor compared to a reference device fabricated with neat GOs. We attribute the improvement in the efficiency of the device to the plasmonic effects of the AuNP-GO nanocomposites, which induced local enhancement of the electromagnetic field. More importantly, the inverted OPVs also exhibited better reliability after the use of AuNP-GO nanocomposites.
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    Synergistic Plasmonic Effects of Metal Nanoparticle-Decorated PEGylated Graphene Oxides in Polymer Solar Cells
    (2015-04-08)
    Chuang, Ming-Kai
    ;
    Chen, Fang-Chung
    ;
    光電工程學系
    ;
    Department of Photonics
    Metal nanostructures that trigger plasmonic near-field effects are often incorporated in organic photovoltaic devices (OPVs) to improve their light-harvesting ability. These nanostructures usually can be positioned in two different locations in a device: (i) within the photon absorption layers and (ii) at the interfaces between the active layer and the metal electrodes. In this study, we developed amphiphilic gold nanoparticles (Au NPs) for use in dual plasmonic nanostructures within OPVs. We employed graphene oxide as the template to anchor the Au NPs, thereby avoiding their aggregation. Furthermore, we added poly(ethylene glycol) (PEG) bis(amine) to the synthesis medium to improve the solubility of the nanocomposites, such that they could be dispersed well in water and in several organic solvents. Accordingly, we could incorporate the PEGylated Au NP/graphene oxides readily into both the buffer layer and photoactive layer of OPVs, which, as a result, exhibited obvious enhancements in their photocurrents and overall device efficiencies. Moreover, we observed different spectral enhancement regions when we positioned the nanocomposites at different locations, reflecting the different dielectric environments surrounding the NPs; this unexpected behavior should assist in enhancing the broadband absorption of solar irradiation.
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    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.