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Memorias de investigación
Artículos en revistas:
Design flexibility of ultrahigh efficiency four-junction inverted metamorphic solar cells
Año:2016
Áreas de investigación
  • Células solares
Datos
Descripción
The inverted metamorphic solar cell has highly tunable bandgaps, in part due to the metamorphic subcells. Using phosphide-based compositionally graded buffers, we show a wide variety of GaInAs solar cells, ranging in bandgap from 1.2 to 0.7 eV. These metamorphic subcells are all high quality and can be used for a wide variety of multijunction designs. GaInAs solar cells with 0.70 eV bandgaps are developed using an InAsP buffer that extends beyond the InP lattice constant, allowing access to an additional 2 mA/cm2 of photocurrent at AM1.5D and 25 °C. This subcell is implemented into a four-junction inverted metamorphic solar cell combined with an appropriate antireflective coating, which increases the series-connected multijunction current by 0.5 mA/cm2 with respect to designs using 0.74-eV GaInAs. However, the optimal design depends on the spectrum and operating temperature. We show how the device flexibility can be used to fine-tune the design for various spectra in order to maximize energy yield for a given operating condition. One-sun devices achieve 35.3 ± 1.2% efficiency under the AM0 spectra and 37.8 ± 1.2% efficiency under the global spectra at 25 °C. Concentrator devices designed for elevated operating temperature achieve 45.6 ± 2.3% peak efficiency under 690� the direct spectrum and 45.2 ± 2.3% efficiency at 1000� and 25 °C. Device optimization is performed for the direct spectrum on 1-sun devices with 2% shadowing, which achieve 39.8 ± 1.2% efficiency under the direct spectrum at 1 sun, highlighting the excellent performance and bandgap tunability of the four-junction inverted metamorphic solar cell. © 2015 IEEE.
Internacional
Si
JCR del ISI
Si
Título de la revista
Ieee Journal of Photovoltaics
ISSN
2156-3381
Factor de impacto JCR
3,736
Información de impacto
Volumen
6
DOI
10.1109/jphotov.2015.2505182
Número de revista
2
Desde la página
578
Hasta la página
583
Mes
SIN MES
Ranking
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Participantes
  • Autor: R.M. France
  • Autor: J.F. Geisz
  • Autor: Ivan Garcia Vara (UPM)
  • Autor: M.A. Steiner
  • Autor: W. E. McMahon
  • Autor: D,J, Friedman
  • Autor: T.E. Moriarty
  • Autor: C. Osterwald
  • Autor: J.S. Ward
  • Autor: A. Duda
  • Autor: M. Young
  • Autor: W.J. Olavarria
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: Instituto de Energía Solar
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