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Memorias de investigación
Artículos en revistas:
Strain-balanced type-II superlattices for efficient multi-junction solar cells
Año:2017
Áreas de investigación
  • Células solares
Datos
Descripción
Multi-junction solar cells made by assembling semiconductor materials with different bandgap energies have hold the record conversion efficiencies for many years and are currently approaching 50%. Theoretical efficiency limits make use of optimum designs with the right lattice constant-bandgap energy combination, which requires a 1.0-1.15 eV material lattice-matched to GaAs/Ge. Nevertheless, the lack of suitable semiconductor materials is hindering the achievement of the predicted efficiencies, since the only candidates were up to now complex quaternary and quinary alloys with inherent epitaxial growth problems that degrade carrier dynamics. Here we show how the use of strain-balanced GaAsSb/GaAsN superlattices might solve this problem. We demonstrate that the spatial separation of Sb and N atoms avoids the ubiquitous growth problems and improves crystal quality. Moreover, these new structures allow for additional control of the effective bandgap through the period thickness and provide a type-II band alignment with long carrier lifetimes. All this leads to a strong enhancement of the external quantum efficiency under photovoltaic conditions with respect to bulk layers of equivalent thickness. Our results show that GaAsSb/GaAsN superlattices with short periods are the ideal (pseudo)material to be integrated in new GaAs/Ge-based multi-junction solar cells that could approach the theoretical efficiency limit.
Internacional
Si
JCR del ISI
Si
Título de la revista
Scientific Reports
ISSN
2045-2322
Factor de impacto JCR
4,259
Información de impacto
Volumen
7
DOI
10.1038/s41598-017-04321-4
Número de revista
1
Desde la página
1
Hasta la página
10
Mes
SIN MES
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: A. Gonzalo
  • Autor: Antonio David Utrilla Lomas (UPM)
  • Autor: D.F. Reyes
  • Autor: V. Braza
  • Autor: J.M. Llorens
  • Autor: David Fuertes Marron (UPM)
  • Autor: B. Alén
  • Autor: T. Ben
  • Autor: D. González
  • Autor: A. Guzman
  • Autor: A. Hierro
  • Autor: J.M. Ulloa
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física, Ingeniería Eléctrica y Física Aplicada
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