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Optical absorption and thermal conductivity of GaAsPN absorbers grown on GaP in view of their use in multijunction solar cells

  • S. Ilahi
  • , S. Almosni
  • , F. Chouchane
  • , M. Perrin
  • , K. Zelazna
  • , N. Yacoubi
  • , R. Kudrawiec
  • , P. Râle
  • , L. Lombez
  • , J. F. Guillemoles
  • , O. Durand
  • , C. Cornet
  • Laboratoire de Recherche de Caractérisation Photo-thermique
  • Université de Carthage
  • Centre national de la recherche scientifique
  • Faculty of Fundamental Problems of Technology
  • Wroclaw University of Technology
  • Institut Photovoltaïque d'Ile-de-France
  • Tokyo University

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The optical absorption and thermal conductivity of GaAsPN absorbers are investigated by means of optical absorption spectroscopy and photo-thermal deflection spectroscopy (PDS) for different 100 nm-thick GaAsNP/GaP samples under different growth conditions and various post-growth annealing temperatures. It is first shown that the As content strongly modifies the optical absorption spectrum of the GaAsPN: with a maximum absorption coefficient of 38,000 cm-1 below the GaP bandgap energy. The optical absorption and thermal conductivities of the samples are then evaluated for various growth and annealing conditions using PDS: the results showing overall agreement with optical absorption spectroscopy measurements. A significant improvement in optical absorption and thermal conductivity after annealing is demonstrated. The best thermal conductivity measured is equal to 4 W/m K. These results are promising for the development of absorbers in multijunction solar-cell architecture.

Original languageEnglish
Pages (from-to)291-298
Number of pages8
JournalSolar Energy Materials and Solar Cells
Volume141
DOIs
Publication statusPublished - 22 Jun 2015

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 7 - Affordable and Clean Energy
    SDG 7 Affordable and Clean Energy

Keywords

  • Diluted-nitride alloy
  • GaAsPN absorbers
  • Multijunction solar cells
  • Photonics on silicon

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