Optically enhanced photon recycling in mechanically stacked multijunction solar cells

Steiner, Myles A. and Geisz, John F. and Ward, J. Scott and García Vara, Iván and Friedman, Daniel J. and King, Richard R. and Chiu, Philip T. and France, Ryan M. and Duda, Anna and Olavarria, Waldo J. and Young, Michelle and Kurtz, Sarah R. (2015). Optically enhanced photon recycling in mechanically stacked multijunction solar cells. "IEEE Journal of Photovoltaics", v. 6 (n. 1); pp. 358-365. ISSN 2156-3381. https://doi.org/10.1109/JPHOTOV.2015.2494690.

Description

Title: Optically enhanced photon recycling in mechanically stacked multijunction solar cells
Author/s:
  • Steiner, Myles A.
  • Geisz, John F.
  • Ward, J. Scott
  • García Vara, Iván
  • Friedman, Daniel J.
  • King, Richard R.
  • Chiu, Philip T.
  • France, Ryan M.
  • Duda, Anna
  • Olavarria, Waldo J.
  • Young, Michelle
  • Kurtz, Sarah R.
Item Type: Article
Título de Revista/Publicación: IEEE Journal of Photovoltaics
Date: 2015
ISSN: 2156-3381
Volume: 6
Subjects:
Freetext Keywords: Luminescent coupling, mechanical stack, multijunction solar cell, photon recycling, III–V solar cell
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Multijunction solar cells can be fabricated by mechanically bonding together component cells that are grown separately. Here, we present four-junction four-terminal mechanical stacks composed of GaInP/GaAs tandems grown on GaAs substrates and GaInAsP/GaInAs tandems grown on InP substrates. The component cells were bonded together with a low-index transparent epoxy that acts as an angularly selective reflector to the GaAs bandedge luminescence, while simultaneously transmitting nearly all of the subbandgap light. As determined by electroluminescence measurements and optical modeling, the GaAs subcell demonstrates a higher internal radiative limit and, thus, higher subcell voltage, compared with GaAs subcells without the epoxy reflector. The best cells demonstrate 38.8 ± 1.0% efficiency under the global spectrum at 1000 W/m2 and ~ 42% under the direct spectrum at ~100 suns. Eliminating the series resistance is the key challenge for further improving the concentrator cells.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7299878METACELLSUNIVERSIDAD POLITECNICA DE MADRIDAdvanced epitaxy of metamorphic semiconductor structures for multijunction solar cells

More information

Item ID: 40979
DC Identifier: http://oa.upm.es/40979/
OAI Identifier: oai:oa.upm.es:40979
DOI: 10.1109/JPHOTOV.2015.2494690
Official URL: https://ieeexplore.ieee.org/document/7322173
Deposited by: Memoria Investigacion
Deposited on: 14 Jun 2016 17:06
Last Modified: 06 Jun 2019 12:49
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