Design and fabrication of cascaded dichromate gelatin holographic filters for spectrum-splitting PV systems
AffiliationUniv Arizona, Dept Elect & Comp Engn, Tucson, AZ 85721 USA
Univ Arizona, Coll Opt Sci, Tucson, AZ USA
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CitationYuechen Wu, Benjamin Chrysler, Raymond K. Kostuk, “Design and fabrication of cascaded dichromate gelatin holographic filters for spectrum-splitting PV systems,” J. Photon. Energy 8(1), 017001 (2018), doi: 10.1117/1.JPE.8.017001.
JournalJOURNAL OF PHOTONICS FOR ENERGY
Rights© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractThe technique of designing, optimizing, and fabricating broadband volume transmission holograms using dichromate gelatin (DCG) is summarized for solar spectrum-splitting applications. The spectrum-splitting photovoltaic (PV) system uses a series of single-bandgap PV cells that have different spectral conversion efficiency properties to more fully utilize the solar spectrum. In such a system, one or more high-performance optical filters are usually required to split the solar spectrum and efficiently send them to the corresponding PV cells. An ideal spectral filter should have a rectangular shape with sharp transition wavelengths. A methodology of designing and modeling a transmission DCG hologram using coupled wave analysis for different PV bandgap combinations is described. To achieve a broad diffraction bandwidth and sharp cutoff wavelength, a cascaded structure of multiple thick holograms is described. A search algorithm is then developed to optimize both single-and two-layer cascaded holographic spectrum-splitting elements for the best bandgap combinations of two-and three-junction spectrum-splitting photovoltaic (SSPV) systems illuminated under the AM1.5 solar spectrum. The power conversion efficiencies of the optimized systems are found to be 42.56% and 48.41%, respectively, using the detailed balance method, and show an improvement compared with a tandem multijunction system. A fabrication method for cascaded DCG holographic filters is also described and used to prototype the optimized filter for the three-junction SSPV system. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
VersionFinal published version
SponsorsNSF/DOE ERC [EEC-1041895]; NSF [ECCS-1405619]