The design of broadband, wide-angle interference filters for solar concentrating systems

Imenes, Anne Gerd; Buie, D.; McKenzie, David R.

doi:10.1016/j.solmat.2005.08.007

Cited by 56 publications

(25 citation statements)

References 51 publications

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“…To be commercially viable this increase in cost should be offset by the efficiency gain. To achieve this, the optical efficiency of the beam splitter and the concentrating components should be high enough to minimise the optical losses caused by the higher complexity of the system [38,39]. Durability of such filters under high illumination in concentrating configurations is also a key issue to be addressed [40].…”

Section: Spectral Splitting Methodsmentioning

confidence: 99%

Spectral beam splitting for efficient conversion of solar energy—A review

Mojiri

Taylor

Thomsen

et al. 2013

Renewable and Sustainable Energy Reviews

321

122

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Section: Spectral Splitting Methodsmentioning

confidence: 99%

Spectral beam splitting for efficient conversion of solar energy—A review

Mojiri

Taylor

Thomsen

et al. 2013

Renewable and Sustainable Energy Reviews

321

122

View full text Add to dashboard Cite

“…It is therefore possible to deviate from an angular characteristic that is defined by the Bragg effect by using certain non-periodic structures. Such an approach has been suggested for example by Imenes [13].…”

Section: Angular Dependencementioning

confidence: 99%

Spectrally-Selective Photonic Structures for PV Applications

et al. 2010

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Abstract:We review several examples of how spectrally-selective photonic structures may be used to improve solar cell systems. Firstly, we introduce different spectrally-selective structures that are based on interference effects. Examples shown include Rugate filter, edge filter and 3D photonic crystals such as artificial opals. In the second part, we discuss several examples of photovoltaic (PV) concepts that utilize spectral selectivity such as fluorescence collectors, upconversion systems, spectrum splitting concepts and the intermediate reflector concept. The potential of spectrally selective filters in the context of solar cells is discussed.

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“…For optimum utilization of the entire solar spectrum, existing spectrum splitting strategies often aim to divert photons below or above the bandgap that are not efficient 4 for PV operation to a solar thermal system, and photons close to and just-above the PV bandgap to PV cells. A variety of methods, such as optical interference filters [6] , selectively-absorbing fluids in combination with PV systems [7] , refractive and luminescent surfaces [8] , volume and surface holograms [9] , dichroic mirrors [8,10] , and luminescent emitters [11] have been utilized for spectral beam splitting. Such systems often require complex optics to direct the short and long wavelength radiation to a thermal component, and additional heat losses resulting from photon absorption in the filter(s) cannot be eliminated.…”

Section: Introductionmentioning

confidence: 99%

“…Two types of interference filters commonly used as spectral splitters are distributed Bragg reflectors (DBRs) with alternating layers of high and low refractive index materials and Rugate filters with graded-index coatings. [10] Distributed Bragg reflectors are onedimensional (1D) photonic crystals (PhCs) that use interference of incident radiation and reflected waves from multiple layer interfaces to form energy band-gaps. They act as mirrors for photons with energies within the bandgaps, enabling frequency-selective filter performance.…”

Section: Introductionmentioning

confidence: 99%

Toward a High‐Efficient Utilization of Solar Radiation by Quad‐Band Solar Spectral Splitting

et al. 2016

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† Supporting information (SI) availableKeyword: quad-band filter, hybrid photovoltaic-thermal collector, solar absorptance, thermal emittance Hybrid photovoltaic-thermal (PVT) solar collectors are being explored to capture the full spectrum of solar energy. Currently, most beam splitting concepts rely on filters that divert photons below the bandgap and/or photons above the bandgap to another solar thermal collector, and the rest for PV conversion. Here, we demonstrate a different strategy: photons of the solar spectrum in the desirable PV band are reflected, while the rest of the photons in the solar spectrum (i.e., below-the-bandgap and high-energy photons) are absorbed in the beam splitter to raise its temperature. The beam splitter also has low emittance in the mid-infrared, effectively suppressing thermal re-radiation losses. The concept is illustrated with a SiO 2 /TiO x multilayered interference filter deposited on top of a conventional ceramic-metal solar thermal absorber, which has high broadband solar absorptance but low infrared emittance. The resulting quad-band filter with four distinct bands (i.e., high reflectance in the PV band, high absorptance above and below the PV band in the solar spectrum, and high reflectance in the middle-to longwavelength infrared range) offers a new approach for spectral splitting of photons to harvest the full solar spectrum by combining solar PV and solar thermal systems.2

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The design of broadband, wide-angle interference filters for solar concentrating systems

Cited by 56 publications

References 51 publications

Spectral beam splitting for efficient conversion of solar energy—A review

Spectral beam splitting for efficient conversion of solar energy—A review

Spectrally-Selective Photonic Structures for PV Applications

Toward a High‐Efficient Utilization of Solar Radiation by Quad‐Band Solar Spectral Splitting

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