Toward ultrahigh-flux photovoltaic concentration

Gordon, Jeffrey M.; Katz, Eugene A.; Feuermann, Daniel; Huleihil, Mahmoud

doi:10.1063/1.1723690

Cited by 81 publications

(52 citation statements)

References 15 publications

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“…Concentration factors which correspond to a given angular restriction are marked, suggesting that very high single-junction efficiencies are possible using existing two-axis solar tracking technology. 19,20 While the results in Figure 2a are encouraging, they assume all recombination is radiative, which is unrealistic in a real material. Since GaAs can be fabricated with very high purity and excellent surface passivation via III-V capping layers, we consider only Auger recombination as it is the sole intrinsic, unavoidable source of nonradiative recombination.…”

Section: (2)mentioning

confidence: 84%

Highly efficient GaAs solar cells by limiting light emission angle

et al. 2013

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In a conventional flat plate solar cell under direct sunlight, light is received from the solar disk, but is re-emitted isotropically. This isotropic emission corresponds to a significant entropy increase in the solar cell, with a corresponding drop in efficiency. Here, using a detailed balance model, we show that limiting the emission angle of a high-quality GaAs solar cell is a feasible route to achieving power conversion efficiencies above 38% with a single junction. The highest efficiencies are predicted for a thin, light trapping cell with an ideal back reflector, though the scheme is robust to a non-ideal back reflector. Comparison with a conventional planar cell geometry illustrates that limiting emission angle in a light trapping geometry not only allows for much thinner cells, but also for significantly higher overall efficiencies with an excellent rear reflector. Finally, we present ray-tracing and detailed balance analysis of two angular coupler designs, show that significant efficiency improvements are possible with these couplers, and demonstrate initial fabrication of one coupler design.

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Section: (2)mentioning

confidence: 84%

Highly efficient GaAs solar cells by limiting light emission angle

et al. 2013

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“…Sunlight was focused into a 1 mm diameter quartz-core optical fiber, and coupled onto the OPV cell [22,23]. Flux uniformity was achieved by placing a multimode, 3 cm Â 1 cm Â 1 cm quartz block between the cell and the fiber.…”

Section: Methodsmentioning

confidence: 99%

Outdoor operation of small-molecule organic photovoltaics

Burlingame

Zanotti

Ciammaruchi

et al. 2017

Organic Electronics

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a b s t r a c tWe measure the diurnal dependence of the operating characteristics of tetraphenyldibenzoperiflanthene (DBP):C 70 planar-mixed heterojunction small-molecule organic photovoltaic (OPV) cells with 2,2 0 ,2 00 -(1,3,5-benzenitryl tris-[1-phenyl-1H-benzimidazole] (TPBi):C 70 electron-filtering cathode buffer layers. Over the course of a day, efficiency gradually increases as a result of a concomitant increase in shortcircuit current, while the fill factor and open-circuit voltage remain constant. The results are analyzed on the basis of independent measurements of temperature-and intensity-dependent OPV performance. The power conversion efficiency is maximized slightly below 1 sun intensity and at 40 C, which is beneficial for practical outdoor operation. We attribute the increased short circuit current with temperature to broadening of the absorption spectrum due to population of phonon states along with increased charge mobility, which also results in an increase in fill factor.

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“…The light spectrum on the cell was nearly invariant and close to the AM1.5. 37 The cell fill factor (FF) and PCE g were calculated as…”

Section: Introductionmentioning

confidence: 99%

Origin of size effect on efficiency of organic photovoltaics

Manor

Katz

Tromholt

et al. 2011

Journal of Applied Physics

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It is widely accepted that efficiency of organic solar cells could be limited by their size. However, the published data on this effect are very limited and none of them includes analysis of light intensity dependence of the key cell parameters. We report such analysis for bulk heterojunction solar cells of various sizes and suggest that the origin of both the size and the light intensity effects should include underlying physical mechanisms other than conventional series resistance dissipation. In particular, we conclude that the distributed nature of the ITO resistance and its influence on the voltage dependence of photocurrent and dark current is the key to understanding size limitation of the organic photovoltaics (OPV) efficiency. Practical methods to overcome this limitation as well as the possibility of producing concentrator OPV cells operating under sunlight concentrations higher than 10 suns are discussed.

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Toward ultrahigh-flux photovoltaic concentration

Cited by 81 publications

References 15 publications

Highly efficient GaAs solar cells by limiting light emission angle

Highly efficient GaAs solar cells by limiting light emission angle

Outdoor operation of small-molecule organic photovoltaics

Origin of size effect on efficiency of organic photovoltaics

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