Results 91 to 100 of about 238 (122)

High Efficiency Multijunction Photovoltaic Development

Industrial & Engineering Chemistry Research, 2012
Photovoltaic energy conversion has demonstrated remarkable improvements in performance over the past 60 years. The rate of solar cell efficiency change has actually increased over the past 20 years as researchers have moved beyond elemental semiconductors to increasingly more sophisticated materials and devices. In addition, significant improvements in
David Wilt, Mark Stan
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Optimization tool for multijunction photovoltaic systems

2014 IEEE 40th Photovoltaic Specialist Conference (PVSC), 2014
The choice of individual bandgaps is important for achieving the maximum efficiency of a multijunction photovoltaic system. The optimization tool described in this paper uses a multijunction photovoltaic (PV) model and determines the bandgap energies that yield the highest possible system power efficiency for a given number of PV junctions.
Kevon C. Charles, John R. Wilcox, Jeffery L. Gray   +2 more
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Peak efficiency of multijunction photovoltaic systems

2010 35th IEEE Photovoltaic Specialists Conference, 2010
The maximum efficiency of multijunction photovoltaic systems is determined for independently connected solar cells that are optically in series. The maximum efficiency is computed as a function of solar concentration using both the Shockley-Queisser detailed balance radiative limit for the reverse saturation current density and a simple empirical ...
J. L. Gray, J. M. Schwarz, J. R. Wilcox, A. W. Haas, R. J. Schwartz   +4 more
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Multijunction organic photovoltaics with a broad spectral response

Physical Chemistry Chemical Physics, 2012
We demonstrate series-integrated multijunction organic photovoltaics fabricated monolithically by vapor-deposition in a transposed subcell order with the near-infrared-absorbing subcell in front of the green-absorbing subcell. This transposed subcell order is enabled by the highly complementary absorption spectra of a near-infrared-absorbing visibly ...
Jill A, Macko, Richard R, Lunt, Timothy P, Osedach, Patrick R, Brown, Miles C, Barr, Karen K, Gleason, Vladimir, Bulovic   +6 more
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Towards commercialization of concentrator multijunction photovoltaic modules

2008 33rd IEEE Photovoltaic Specialists Conference, 2008
Concentrating photovoltaic (CPV) modules occupy the middle ground between conventional, flat-plate photovoltaics and concentrating solar power (CSP) technologies. CPV promises to deliver the best of both worlds: the highest efficiency of any photovoltaic system combined with the higher capacity factor and scale-up potential of dual-axis tracking ...
G. S. Kinsey, R. A. Sherif, P. Pien, P. Hebert, R. R. King, D. Aldrich   +5 more
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A cassegrain concentrator photovoltaic system: Comparison between dichroic and multijunction photovoltaic configurations

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
In the present paper a novel configuration of high concentrator photovoltaic (HCPV) systems based on Cassegrain optics has been presented. The proposed system has been designed in order to be suitable for the implementation of both multi-junction and spectrum splitting configurations. The Cassegrain optic design, the components and material choices for
Vincenzi D, Baricordi S, Calabrese S, MUSIO, MAURA, DAMIANO, ALFONSO   +4 more
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Spectrum-optimized Si-based III-V multijunction photovoltaics

SPIE Proceedings, 2012
A III-V/Si metamorphic epitaxy approach to achieve multi-junction solar cells having nearly ideal optical partitioning of the solar spectrum is described. Following our previously-established methodology for the growth of defect-free GaP on Si(100) substrates and demonstrations of heteroepitaxially integrated III-V-on-Si photovoltaics via GaAs y P 1 ...
Tyler J. Grassman, Andrew M. Carlin, Javier Grandal, Chris Ratcliff, Limei Yang, Michael J. Mills, Steven A. Ringel   +6 more
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Multijunction organic photovoltaic cells for underwater solar power

2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC), 2015
A modeling and simulation effort is presented that produces a design of an novel organic photovoltaic (OPV) device specifically tailored for underwater (UW) operation. An analysis of the UW environment is presented which highlights the significant advantages of OPV for UW operation.
R. J. Walters, W. Yoon, D. Placencia, D. Scheiman, M. P. Lumb, A. Strang, P. N. Stavrinou, P. P. Jenkins   +7 more
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Multijunction upper subcell cascade photovoltaics for space applications

Journal of Applied Physics, 1988
A new class of cascade high-efficiency photovoltaics designed for space-based applications is proposed. The design improves upper subcell performance and avoids electrical and optical losses associated with an intercell ohmic contact. Multijunction upper subcells reduce bulk recombination of photogenerated minority carriers by decreasing the average ...
J. L. Educato, M. Wagner, J. P. Leburton
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III–V multijunction solar cells for concentrating photovoltaics

Energy Environ. Sci., 2009
Concerns about the changing environment and fossil fuel depletion have prompted much controversy and scrutiny. One way to address these issues is to use concentrating photovoltaics (CPV) as an alternate source for energy production. Multijunction solar cells built from III–V semiconductors are being evaluated globally in CPV systems designed to ...
Hector Cotal, Chris Fetzer, Joseph Boisvert, Geoffrey Kinsey, Richard King, Peter Hebert, Hojun Yoon, Nasser Karam   +7 more
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