Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Three-bandgap absolute quantum efficiency in intermediate band solar cells
Year:2017
Research Areas
  • Solar energy,
  • Semiconductors ii-vi, iii-v and iv-iv,
  • Solar cells,
  • Photovoltaic generation
Information
Abstract
In this work we study GaSb/GaAs quantum-dot intermediate band solar cells (IBSCs) by means of quantum efficiency (QE) measurements. We are able, for the first time, to measure an absolute QE which clearly reveals the three characteristic bandgaps of an IBSC; EG, EH and EL, for which we found the values 1.52, 1.03 and 0.49 eV, respectively, at 20 K. Under monochromatic illumination, the QE at the energies EH and EL is 10-4 and 10-8, respectively. These low values are explained by the lack of efficient mechanisms of completing the second sub-bandgap transition when only monochromatic illumination is used. The addition of a secondary light source (E = 1.32 eV) during the measurements produces an increase in the measured QE at EL of almost three orders of magnitude.
International
Si
Congress
44th IEEE Photovoltaic Specialist Conference
960
Place
Washington, DC, EEUU
Reviewers
Si
ISBN/ISSN
978-1-5090-5605-7
10.1109/pvsc.2017.8366700
Start Date
25/06/2017
End Date
30/06/2017
From page
1
To page
3
Proc. 44th IEEE PVSC
Participants
  • Autor: Iñigo Ramiro Gonzalez (UPM)
  • Autor: Elisa Antolin Fernandez (UPM)
  • Autor: J. Hwang
  • Autor: A. Teran
  • Autor: A.J. Martin
  • Autor: J. Millunchick
  • Autor: J. Phillips
  • Autor: Antonio Marti Vega (UPM)
  • Autor: Antonio Luque Lopez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física, Ingeniería Eléctrica y Física Aplicada
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
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