Browsing by Author "Tan, Kim-Shih"

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Near-infrared laser-driven polymer photovoltaic devices and their biomedical applications
(2011-09-01)
Wu, Jyh-Lih
;
Chen, Fang-Chung
;
Chuang, Ming-Kai
;
Tan, Kim-Shih
;
光電工程學系
We demonstrate near-infrared laser-driven (NIRLD) organic photovoltaic devices (OPVs), which can directly convert 980 nm light into electrical power. We attribute the NIR photovoltaic response to the long-wavelength absorption of charge transfer (CT) states. Direct excitation through CT states might open up new avenues for harvesting the long-wavelength spectrum of solar irradiation. Further, because of the high transparency of biological tissue toward 980 nm light, these NIRLD OPVs might be a promising wireless electrical source for biological nanodevices.
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.
Upconversion effects on the performance of near-infrared laser-driven polymer photovoltaic devices
(2012-10-01)
Wu, Jyh-Lih
;
Chen, Fang-Chung
;
Chang, Shu-Hao
;
Tan, Kim-Shih
;
Tuan, Hsing-Yu
We have explored the upconversion (UC) effects resulting from the presence of NaYF4:Yb/Er nanocrystals in near-infrared laser-driven organic photovoltaic devices (OPVs). Illumination of these UC nanomaterials with monochromatic light (980 nm) led to emission of visible light, which was subsequently absorbed by the polymer photoactive layer. We infer that both the long-wavelength charge-transfer absorption of the polymer blend and the UC effect contributed to the obvious near-infrared photovoltaic response. The resulting UC effects led to noticeable enhancements in the photocurrent and the efficiencies of the OPV devices under illumination at 980 nm. (c) 2012 Elsevier B.V. All rights reserved.