Broadband photoluminescent quantum yield optimisation of Er 3+-doped β-NaYF4 for upconversion in silicon solar cells

Sean K. W. MacDougall, Aruna Ivaturi, Jose Marques-Hueso, Karl W. Krämer, Bryce S. Richards

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Upconversion is a promising technique for harvesting sub-band-gap photons in photovoltaic devices. In this work, the optimum erbium (Er3+) doping within the efficient upconverting host material hexagonal sodium yttrium fluoride (β-NaYF4) is investigated for a wide range of irradiance values and under broadband excitation (80±1 nm). Measurements of the internal photoluminescent quantum yield (iPLQY) have been conducted over two orders of magnitude in irradiance, the corresponding solar concentrations characterised, and the external photoluminescent quantum yield (ePLQY) determined. The iPLQY measurements required calibration due to overlap of absorption and re-emission in the range of 1450-1600 nm. The highest iPLQY was for 20% Er3+ with a value of 10.7±1.2% and a normalised efficiency of (5.43±0.90)×10-4 cm2 W -1 at an irradiance of 1.97±0.24 MW m-2 ((108±13)×103 Suns). More importantly for application to silicon solar cells, the highest ePLQY was for 25% Er3+ and was measured to be 6.6±0.7% ((3.35±0.56)×10-4 cm 2 W-1), which agrees well with monochromatic investigations. The 25% Er3+ sample was shown to be more efficient due to an anomalous increase and broadening of the absorption in comparison to lower concentrations. Furthermore, energy transfer mechanisms are proposed for the reduced efficiency of higher concentrations and depletion of the upconversion luminescence.

LanguageEnglish
Pages18-26
Number of pages9
JournalSolar Energy Materials and Solar Cells
Volume128
Early online date27 May 2014
DOIs
Publication statusPublished - 30 Sep 2014

Fingerprint

Silicon solar cells
Quantum yield
Erbium
Yttrium
Fluorides
Energy transfer
Luminescence
Energy gap
Photons
Sodium
Doping (additives)
Calibration

Keywords

  • broad-band excitation
  • photoluminescence quantum yield
  • silicon photovoltaics
  • spectral conversion
  • upconversion

Cite this

MacDougall, Sean K. W. ; Ivaturi, Aruna ; Marques-Hueso, Jose ; Krämer, Karl W. ; Richards, Bryce S. / Broadband photoluminescent quantum yield optimisation of Er 3+-doped β-NaYF4 for upconversion in silicon solar cells. In: Solar Energy Materials and Solar Cells. 2014 ; Vol. 128. pp. 18-26.
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Broadband photoluminescent quantum yield optimisation of Er 3+-doped β-NaYF4 for upconversion in silicon solar cells. / MacDougall, Sean K. W.; Ivaturi, Aruna; Marques-Hueso, Jose; Krämer, Karl W.; Richards, Bryce S.

In: Solar Energy Materials and Solar Cells, Vol. 128, 30.09.2014, p. 18-26.

Research output: Contribution to journalArticle

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T1 - Broadband photoluminescent quantum yield optimisation of Er 3+-doped β-NaYF4 for upconversion in silicon solar cells

AU - MacDougall, Sean K. W.

AU - Ivaturi, Aruna

AU - Marques-Hueso, Jose

AU - Krämer, Karl W.

AU - Richards, Bryce S.

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