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Demonstration of optical interference filters utilizing tunable refractive index layers
Poxson, David J.,Mont, Frank W.,Schubert, Martin F.,Kim, Jong Kyu,Cho, Jaehee,Schubert, E. Fred The Optical Society 2010 Optics express Vol.18 No.suppl4
<P>Optical interference filters utilizing tunable refractive index layers are shown to have higher spectral fidelity as compared to conventional filters consisting of non-tunable refractive index layers. To demonstrate this increase in spectral fidelity, we design and compare a variety of optical interference filters employing both tunable and non-tunable refractive index layers. Additionally, a five-layer optical interference filter utilizing tunable refractive index layers is designed and fabricated for use with a Xenon lamp to replicate the Air Mass 0 solar irradiance spectrum and is shown to have excellent spectral fidelity.</P>
Yan, Xing,Poxson, David J.,Cho, Jaehee,Welser, Roger E.,Sood, Ashok K.,Kim, Jong Kyu,Schubert, E. Fred WILEY‐VCH Verlag 2013 Advanced Functional Materials Vol.23 No.5
<P><B>Abstract</B></P><P>An optimized four‐layer tailored‐ and low‐refractive index anti‐reflection (AR) coating on an inverted metamorphic (IMM) triple‐junction solar cell device is demonstrated. Due to an excellent refractive index matching with the ambient air by using tailored‐ and low‐refractive index nanoporous SiO<SUB>2</SUB> layers and owing to a multiple‐discrete‐layer design of the AR coating optimized by a genetic algorithm, such a four‐layer AR coating shows excellent broadband and omnidirectional AR characteristics and significantly enhances the omnidirectional photovoltaic performance of IMM solar cell devices. Comparing the photovoltaic performance of an IMM solar cell device with the four‐layer AR coating and an IMM solar cell with the conventional SiO<SUB>2</SUB>/TiO<SUB>2</SUB> double layer AR coating, the four‐layer AR coating achieves an angle‐of‐incidence (AOI) averaged short‐circuit current density, <I>J</I><SUB>SC</SUB>, enhancement of 34.4%, whereas the conventional double layer AR coating only achieves an AOI‐averaged <I>J</I><SUB>SC</SUB> enhancement of 25.3%. The measured reflectance reduction and omnidirectional photovoltaic performance enhancement of the four‐layer AR coating are to our knowledge, the largest ever reported in the literature of solar cell devices.</P>
Oh, Seung Jae,Chhajed, Sameer,Poxson, David J,Cho, Jaehee,Schubert, E Fred,Tark, Sung Ju,Kim, Donghwan,Kim, Jong Kyu Optical Society of America 2013 Optics express Vol.21 No.1
<P>The performance enhancement of polycrystalline Si solar cells by using an optimized discrete multilayer anti-reflection (AR) coating with broadband and omni-directional characteristics is presented. Discrete multilayer AR coatings are optimized by a genetic algorithm, and experimentally demonstrated by refractive-index tunable SiO2 nano-helix arrays and co-sputtered (SiO2)x(TiO2)1?x thin film layers. The optimized multilayer AR coating shows a reduced total reflection, leading to the high incident-photon-to-electron conversion efficiency over a correspondingly wide range of wavelengths and incident angles, offering a very promising way to harvest more solar energy by virtually any type of solar cells for a longer time of a day.</P>