Design for energy: Modeling of spectrum, temperature and device structure dependences of solar cell energy production

Broderick, Lirong Z.; Albert, Brian R.; Pearson, Brian S.; Kimerling, Lionel C.; Michel, Jürgen

doi:10.1016/j.solmat.2014.12.034

Cited by 41 publications

(18 citation statements)

References 52 publications

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“…An Rsoft 18 RCWA simulator was used to compute the DE with the index and period functions given in Eqs. (11) and (12). Figure 7 shows the spectral diffraction efficiencies as a function of S and C for the optimized gratings (A and B) of three-junction system designed in Table 3.…”

Section: Dichromate Gelatin Grating Modelingmentioning

confidence: 99%

“…Since each PV cell is separated, lattice matching is not an issue and different material types can be used. 11 In addition, the cells are connected in parallel and the total current is not current limited by the lowest output cell. 12 However, the complexity of the system now resides in the optics, which must effectively separate the different spectral bands of the incident solar illumination and direct them to corresponding cells.…”

Section: Introductionmentioning

confidence: 99%

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Design and fabrication of cascaded dichromate gelatin holographic filters for spectrum-splitting PV systems

Chrysler

Kostuk

2018

J. Photon. Energy

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, "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. Abstract. The 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 threejunction 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.

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Section: Dichromate Gelatin Grating Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and fabrication of cascaded dichromate gelatin holographic filters for spectrum-splitting PV systems

Chrysler

Kostuk

2018

J. Photon. Energy

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“…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. Since each PV cell is separated lattice matching is not an issue and different material types can be used 11 . In addition, the cells are connected in parallel and the total current is not current limited by the lowest output cell 12 .…”

Section: Introductionmentioning

confidence: 99%

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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“…First, the performance of tandem PV cells is limited by the bandgap with the lowest current and is optimized for standard solar spectrum. As a result, the systems using tandem MJ PV cells can suffer from significant loss in efficiency when operating under actual operating conditions 5 . Next, the acceptance angle of an optical CPV system is restricted by the conservation low of etendue.…”

Section: Introductionmentioning

confidence: 99%

Three junction holographic micro-scale PV system

Vorndran

Pelaez

et al. 2016

SPIE Proceedings

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In this work a spectrum splitting micro-scale concentrating PV system is evaluated to increase the conversion efficiency of flat panel PV systems. In this approach, the dispersed spectrum splitting concentration systems is scaled down to a small size and structured in an array. The spectrum splitting configuration allows the use of separate single bandgap PV cells that increase spectral overlap with the incident solar spectrum. This results in an overall increase in the spectral conversion efficiency of the resulting system. In addition other benefits of the micro-scale PV system are retained such reduced PV cell material requirements, more versatile interconnect configurations, and lower heat rejection requirements that can lead to a lower cost system. The system proposed in this work consists of two cascaded off-axis holograms in combination with a micro lens array, and three types of PV cells. An aspherical lens design is made to minimize the dispersion so that higher concentration ratios can be achieved for a three-junction system. An analysis methodology is also developed to determine the optical efficiency of the resulting system, the characteristics of the dispersed spectrum, and the overall system conversion efficiency for a combination of three types of PV cells.

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Design for energy: Modeling of spectrum, temperature and device structure dependences of solar cell energy production

Cited by 41 publications

References 52 publications

Design and fabrication of cascaded dichromate gelatin holographic filters for spectrum-splitting PV systems

Design and fabrication of cascaded dichromate gelatin holographic filters for spectrum-splitting PV systems

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

Three junction holographic micro-scale PV system

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