Grating-over-lens concentrating photovoltaic spectrum splitting systems with volume holographic optical elements

Russo, Juan M.; Zhang, Deming; Gordon, Michael; Vorndran, Shelby; Wu, Youchen; Kostuk, Raymond K.

doi:10.1117/12.2026020

Cited by 12 publications

(20 citation statements)

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“…The resulting filtering properties were then used to compute the power conversion efficiencies for the different configurations using the detailed balance method 4 . The improvement over best bandgap (IoBB) is also calculated for each system as a metric for system performance 5 . For comparison, the efficiencies of tandem MJ PV cells with the same bandgap combinations are calculated including the restriction due to current constraints.…”

Section: Optimization and Modeling Resultsmentioning

confidence: 99%

“…Several papers have demonstrated that the losses from 3) can be minimized by concentrating the dispersed spectral bands diffracted by the holographic elements. This can be achieved either by using an additional focusing system [5][6][7] , or adding power directly into the diffractive element 8 . In this research, we only focused on minimizing the loss from 1) and 2) of the holographic spectrum splitting elements, and assume no loss due to 3).…”

Section: Evaluating Optical Filtersmentioning

confidence: 99%

“…An alternative to BBC-MJPV cell systems are spectrum splitting collectors (SSC) with a set of single junction PV (SJPV) cells that have different energy bandgaps [5][6][7][8][9][10] . In this approach the optical system spatially separates incident solar illumination into different spectral bands and directs each band to a PV cell that has the highest response to the spectral band.…”

Section: Introductionmentioning

confidence: 99%

“…The dispersion approach applies a transmitted dispersive optics which could be either prisms or diffraction gratings to laterally split the incident spectrum at a receiver plan [5][6][7][8] . Compared with reflection approach, the dispersive spectrum splitting benefits from its simple structure of a system with more than two junctions, and the ability of mass production.…”

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confidence: 99%

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Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems

Chrysler

Pelaez

Kostuk

et al. 2017

Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV

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In this work, the technique of designing and optimizing broadband volume transmission holograms using dichromate gelatin (DCG) is summarized for solar spectrum-splitting application. Spectrum splitting photovoltaic 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. DCG is a near ideal holographic material for solar applications as it can achieve high refractive index modulation, low absorption and scattering properties and long-term stability to solar exposure after sealing. In this research, 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 cut-off wavelength, a cascaded structure of multiple thick holograms is described. A search algorithm is also developed to optimize both single and two-layer cascaded holographic spectrum splitters for the best bandgap combinations of twoand three-junction SSPV systems illuminated under the AM1.5 solar spectrum. The power conversion efficiencies of the optimized systems under the AM1.5 solar spectrum are then calculated using the detailed balance method, and shows an improvement compared with tandem structure.

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Section: Optimization and Modeling Resultsmentioning

confidence: 99%

Section: Evaluating Optical Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems

Chrysler

Pelaez

Kostuk

et al. 2017

Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV

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“…Recent interest in spectrum splitting has focused on novel optical design methods and configurations to enable improved form factors and increased efficiency. [6][7][8][9] Fundamentally, spectrum splitting optics require precise characterization of the laterally dispersed illumination incident on each subcell, as well as any stray light lost to passive elements within the photovoltaic system. We have developed an optical characterization system that enables us to map the spatial, spectral, and angular distribution of illumination incident on an optical reception plane.…”

Section: Introductionmentioning

confidence: 99%

Positional irradiance measurement: characterization of spectrum-splitting and concentrating optics for photovoltaics

et al. 2014

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Multijunction photovoltaics enable significantly improved efficiency over their single junction analogues by mitigating unabsorbed sub-bandgap photons and voltage loss to carrier thermalization. Lateral spectrum-splitting configurations promise further increased efficiency through relaxation of the lattice-and current-matching requirements of monolithic stacks, albeit at the cost of increased optical and electrical complexity. Consequently, in order to achieve an effective spectrum-splitting photovoltaic configuration it is essential that all optical losses and photon misallocation be characterized and subsequently minimized.We have developed a characterization system that enables us to map the spatial, spectral, and angular distribution of illumination incident on the subcell reception plane or emerging from any subset of the concentrating and splitting optics. This positional irradiance measurement system (PIMS) comprises four motorized stages assembled in an X-Z-R-Y configuration with three linear degrees of freedom and one rotational degree of freedom, on which we mount an optical fiber connected to a set of spectrometers covering the solar spectrum from 280-1700 nm. In combination with a xenon arc lamp solar simulator with a divergence half angle of 1.3 degrees, we are able to characterize our optics across the full spectrum of our photovoltaic subcells with close agreement to outdoor conditions. We have used this tool to spectrally characterize holographic diffraction efficiency versus diffraction angle; multilayer dielectric filter transmission and reflection efficiency versus filter incidence angle; and aspheric lens chromatic aberration versus optic-to-receiver separation distance. These examples illustrate the versatility of the PIMS in characterizing optical performance relevant to both spectrum-splitting and traditional multijunction photovoltaics.

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Holographic solar energy systems: The role of optical elements

Collados

Chemisana

Atencia

2016

Renewable and Sustainable Energy Reviews

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Grating-over-lens concentrating photovoltaic spectrum splitting systems with volume holographic optical elements

Cited by 12 publications

References 0 publications

Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems

Design and optimization of cascaded DCG based holographic elements for spectrum-splitting PV systems

Positional irradiance measurement: characterization of spectrum-splitting and concentrating optics for photovoltaics

Holographic solar energy systems: The role of optical elements

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