Effects of internal luminescence and internal optics on V-oc and J(sc) of III-V solar cells

Steiner, Myles A. and Geisz, John F. and García Vara, Iván and Friedman, Daniel J. and Duda, Anna and Olavarria, Waldo J. and Young, Michelle and Kuciauskas, Darius and Kurtz, Sarah R. (2013). Effects of internal luminescence and internal optics on V-oc and J(sc) of III-V solar cells. "IEEE Journal of Photovoltaics", v. 3 (n. 4); pp. 1437-1442. ISSN 2156-3381. https://doi.org/10.1109/JPHOTOV.2013.2278666.

Description

Title: Effects of internal luminescence and internal optics on V-oc and J(sc) of III-V solar cells
Author/s:
  • Steiner, Myles A.
  • Geisz, John F.
  • García Vara, Iván
  • Friedman, Daniel J.
  • Duda, Anna
  • Olavarria, Waldo J.
  • Young, Michelle
  • Kuciauskas, Darius
  • Kurtz, Sarah R.
Item Type: Article
Título de Revista/Publicación: IEEE Journal of Photovoltaics
Date: October 2013
ISSN: 2156-3381
Volume: 3
Subjects:
Freetext Keywords: Luminescence, luminescent coupling, photon recycling, radiative recombination, III–V solar cell
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

For solar cells dominated by radiative recombination, the performance can be significantly enhanced by improving the internal optics. Internally radiated photons can be directly emitted from the cell, but if confined by good internal reflectors at the front and back of the cell they can also be re-absorbed with a significant probability. This so-called photon recycling leads to an increase in the equilibrium minority carrier concentration and therefore the open-circuit voltage, Voc. In multijunction cells, the internal luminescence from a particular junction can also be coupled into a lower bandgap junction where it generates photocurrent in addition to the externally generated photocurrent, and affects the overall performance of the tandem. We demonstrate and discuss the implications of a detailed model that we have developed for real, non-idealized solar cells that calculates the external luminescent efficiency, accounting for wavelength-dependent optical properties in each layer, parasitic optical and electrical losses, multiple reflections within the cell and isotropic internal emission. The calculation leads to Voc, and we show data on high quality GaAs cells that agree with the trends in the model as the optics are systematically varied. For multijunction cells the calculation also leads to the luminescent coupling efficiency, and we show data on GaInP/GaAs tandems where the trends also agree as the coupling is systematically varied. In both cases, the effects of the optics are most prominent in cells with good material quality. The model is applicable to any solar cell for which the optical properties of each layer are well-characterized, and can be used to explore a wide phase space of design for single junction and multijunction solar cells.

More information

Item ID: 26283
DC Identifier: http://oa.upm.es/26283/
OAI Identifier: oai:oa.upm.es:26283
DOI: 10.1109/JPHOTOV.2013.2278666
Official URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=06588307
Deposited by: Memoria Investigacion
Deposited on: 31 May 2014 13:17
Last Modified: 22 Sep 2014 11:40
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