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Memorias de investigación
Artículos en revistas:
Back reflectors based on buried Al2O3 for enhancement of photon recycling in monolithic, on-substrate III-V solar cells
Año:2014
Áreas de investigación
  • Ingeniería eléctrica, electrónica y automática
Datos
Descripción
Photon management has been shown to be a fruitful way to boost the open circuit voltage and efficiency of high quality solar cells. Metal or low-index dielectric-based back reflectors can be used to confine the reemitted photons and enhance photon recycling. Gaining access to the back of the solar cell for placing these reflectors implies having to remove the substrate, with the associated added complexity to the solar cell manufacturing. In this work, we analyze the effectiveness of a single-layer reflector placed at the back of on-substrate solar cells, and assess the photon recycling improvement as a function of the refractive index of this layer. Al2O3-based reflectors, created by lateral oxidation of an AlAs layer, are identified as a feasible choice for on-substrate solar cells, which can produce a V-oc increase of around 65% of the maximum increase attainable with an ideal reflector. The experimental results obtained using prototype GaAs cell structures show a greater than two-fold increase in the external radiative efficiency and a V-oc increase of similar to 2% (similar to 18 mV), consistent with theoretical calculations. For GaAs cells with higher internal luminescence, this V-oc boost is calculated to be up to 4% relative (36 mV), which directly translates into at least 4% higher relative efficiency.
Internacional
Si
JCR del ISI
Si
Título de la revista
Applied Physics Letters
ISSN
0003-6951
Factor de impacto JCR
3,515
Información de impacto
Volumen
105
DOI
10.1063/1.4897149
Número de revista
13
Desde la página
133507-1
Hasta la página
133507-5
Mes
SIN MES
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Ivan Garcia Vara (UPM)
  • Autor: C.F. Kearns-McCoy
  • Autor: J.S. Ward
  • Autor: M.A. Steiner
  • Autor: J.F. Geisz
  • Autor: S.R. Kurtz
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Semiconductores III-V
  • Departamento: Electrónica Física
  • Centro o Instituto I+D+i: Instituto de Energía Solar
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