Browsing by Author "Chang, W. -L."

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Biomimetic nanostructured antireflection coating and its application on crystalline silicon solar cells
(2011-07-18)
Chen, J. Y.
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Chang, W. -L.
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Huang, C. K.
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Sun, K. W.
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應用化學系
In this report, we demonstrate the implementation of biomimetic nanostructured antireflection coatings with polymethyl methacrylate (PMMA) layer on the micro-textured surface of silicon crystalline solar cells. To reduce cost, the process combines colloidal lithography, cast molding method, and reversal nanoimprint lithography. The technique is simple, low cost, and does not cause damage to the thin and brittle conventional crystalline solar cells. The antireflection properties of this biomimetic nanostructure coating are considered as effective as those of a conventional single-layer SiN(x) thin film. The resultant structures alone could reduce the average reflectance of solar cell from 13.2% to 7.8% and enhance power conversion efficiency from 12.85% to 14.2%. (C)2011 Optical Society of America
Efficiency enhancement of the poly-silicon solar cell using self-assembled dielectric nanoparticles
(2011-08-01)
Huang, C. K.
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Lin, H. H.
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Chen, J. Y.
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Sun, K. W.
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Chang, W. -L.
In this study, silica nanospheres dispersed in a surfactant solution were spin-coated on commercially available silicon solar cells to form colloidal crystals on the surface. This self-assembled nanoparticle layer served as an anti-reflection (AR) layer for solar cell devices. The self-assembled layer exhibits excellent anti-reflection properties in the UV and NIR wavelength regions, and the reflectance spectra match the theoretical prediction done using the rigorous coupled-wave analysis model. We also showed that the overall conversion efficiency of polycrystalline Si solar cells coated with the silica nanospheres was increased from 11% to 12.3% when using optimized spin-coating parameters and nanoparticle concentrations. (C) 2011 Elsevier B.V. All rights reserved.
Enhanced light harvesting of Si solar cells via luminescent down-shifting using YVO4:Bi3+, Eu3+ nanophosphors
(2013-11-01)
Huang, C. K.
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Chen, Y. C.
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Hung, W. B.
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Chen, T. M.
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Sun, K. W.
The colloids of YVO4 nanoparticles on microtextured Si surface are demonstrated to have promising potential for efficient solar spectrum utilization in crystalline Si solar cells. The solar cells showed an enhancement of 4% in short-circuit current density and approximately 0.7% in power conversion efficiency when coated with YVO4 nanoparticles. The properties of cells integrated with YVO4 nanoparticles were characterized to identify the role of YVO4 in improved light harvesting. The current experiments conclude that the colloids of YVO4 nanoparticles not only act as luminescent down-shifting centers in the ultraviolet region but also serve as an antireflection coating for enhancing the light absorption in the measured spectral regime. Copyright (c) 2012 John Wiley & Sons, Ltd.