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dc.contributor.authorTanaka, Yoshinorija
dc.contributor.authorIshizaki, Kenjija
dc.contributor.authorZoysa, Menaka Deja
dc.contributor.authorUmeda, Takamija
dc.contributor.authorKawamoto, Yosukeja
dc.contributor.authorFujita, Shoyaja
dc.contributor.authorNoda, Susumuja
dc.contributor.alternative田中, 良典ja
dc.description.abstractEnhancing the absorption of thin-film microcrystalline silicon solar cells over a broadband range in order to improve the energy conversion efficiency is a very important challenge in the development of low cost and stable solar energy harvesting. Here, we demonstrate that a broadband enhancement of the absorption can be achieved by creating a large number of resonant modes associated with two-dimensional photonic crystal band edges. We utilize higher-order optical modes perpendicular to the silicon layer, as well as the band-folding effect by employing photonic crystal superlattice structures. We establish a method to incorporate photonic crystal structures into thin-film (~500 nm) microcrystalline silicon photovoltaic layers while suppressing undesired defects formed in the microcrystalline silicon. The fabricated solar cells exhibit 1.3 times increase of a short circuit current density (from 15.0 mA/cm2 to 19.6 mA/cm2) by introducing the photonic crystal structure, and consequently the conversion efficiency increases from 5.6% to 6.8%. Moreover, we theoretically analyze the absorption characteristics in the fabricated cell structure, and reveal that the energy conversion efficiency can be increased beyond 9.5% in a structure less than 1/400 as thick as conventional crystalline silicon solar cells with an efficiency of 24%.ja
dc.publisherJohn Wiley & Sons Ltd.ja
dc.rights© 2015 The Authors. Progress in Photovoltaics: Research and Applications published by John Wiley & Sons Ltd.ja
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.ja
dc.subjectphotonic crystalja
dc.subjectmicrocrystalline siliconja
dc.subjectsolar cellja
dc.titlePhotonic crystal microcrystalline silicon solar cellsja
dc.type.niitypeJournal Articleja
dc.identifier.jtitleProgress in Photovoltaics: Research and Applicationsja
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