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Rare Earth Ions Doped Down-conversion Materials for Third Generation Photovoltaic Solar Cells
LTI departement de Genie industriel ENSA Tanger, Universite Abdelmalek Essadi, Laboratoire des technologies innovantes, Tanger, Morocco.
LTI departement de Genie industriel ENSA Tanger, Universite Abdelmalek Essadi, Laboratoire des technologies innovantes, Tanger, Morocco.
LTI departement de Genie industriel ENSA Tanger, Universite Abdelmalek Essadi, Laboratoire des technologies innovantes, Tanger, Morocco.
LTI departement de Genie industriel ENSA Tanger, Universite Abdelmalek Essadi, Laboratoire des technologies innovantes, Tanger, Morocco.
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2018 (English)In: Proceedings of 2017 International Renewable and Sustainable Energy Conference, IRSEC 2017, IEEE, 2018, article id 8477416Conference paper, Published paper (Refereed)
Abstract [en]

In order to enhance the efficiency of photovoltaic solar cells and overcome their limitations, a matching between solar spectrum and semiconductor band gap is needed using luminescent materials. The following work present in this paper is mainly based on the adjustment of the solar spectrum to the cell bandgap by developing downconverting materials. Down conversion process is exploited to modify the solar spectrum due to a cooperative energy transfer between Tb 3+ and two Yb 3+ rare earth ions in silica-hafnia waveguides. Tb 3+ /Yb 3+ -codoped SiO 2 -HfO 2 planar waveguides have been prepared by sol gel route, using a dip-coating deposition on SiO 2 substrates. The waveguides were obtained with different concentrations and the total amount was [Tb 3+ +Yb 3+ ] = 5%, 7%, 9%, keeping constant the molar ratio [Yb]/[Tb]=4. The comparison between the glass and the glass-ceramic structures demonstrated that the energy transfer is more efficient in glass ceramic since it combines the good optical properties of glasses with the optimal spectroscopic properties of crystals activated by luminescent species. A maximum quantum transfer efficiency of 154.6% was found for the highest rare earth doping concentration.

Place, publisher, year, edition, pages
IEEE, 2018. article id 8477416
Keywords [en]
Rare earth, Down conversion, Energy transfer, Solar cells, Optical waveguides
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Other Physics Topics
Research subject
Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-72224DOI: 10.1109/IRSEC.2017.8477416Scopus ID: 2-s2.0-85055887124ISBN: 978-1-5386-2847-8 (electronic)OAI: oai:DiVA.org:ltu-72224DiVA, id: diva2:1272555
Conference
5th International Renewable and Sustainable Energy Conference, IRSEC 2017, Tangier, Morocco, 4-7 December 2017
Available from: 2018-12-19 Created: 2018-12-19 Last updated: 2018-12-19Bibliographically approved

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Enrichi, Francesco

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