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Visible to NIR downconversion process in Tb3+-Yb3+ codoped silica-hafnia glass and glass-ceramic sol-gel waveguides for solar cells
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-3443-3707
CSMFO Lab., Istituto di Fotonica e Nanotecnologie CNR.
Laboratoire des Technologies Innovantes, LTI, Université Abdelmalek Essâadi, Tanger.
Laboratoire des Technologies Innovantes, LTI, Université Abdelmalek Essâadi, Tanger.
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2018 (English)In: Journal of Luminescence, ISSN 0022-2313, E-ISSN 1872-7883, Vol. 193, 44-50 p.Article in journal (Refereed) Published
Abstract [en]

The efficiency of photovoltaic solar cells is strongly related to the spectral absorption and photo-conversion properties of the cell's active material, which does not exploit the whole broadband solar spectrum. This mismatch between the spectrum of the solar light and the wavelength dependent cell's response can be partially overcome by using luminescent conversion layers in front or in the back of the solar cell. In this paper, the investigation of Tb3+-Yb3+ co-doped SiO2-HfO2 glass and glass-ceramic waveguides is presented. Due to a down-conversion process based on cooperative energy transfer between one Tb3+ ion and two Yb3+ ions, a blue photon at 488 nm can be divided in two NIR photons at 980 nm. Films with different molar concentrations of rare earths, up to a total amount of [Tb+Yb] = 15%, were prepared by a sol-gel route, using dip-coating deposition on SiO2 substrates. For all the films, the molar ratio [Yb]/[Tb] was taken equal to 4. The comparison of the energy-transfer efficiency between Tb3+ and Yb3+ ions in the glass and in the glass-ceramic materials demonstrated the higher performance of the glass-ceramic, with a maximum quantum transfer efficiency of 179% for the highest rare earth doping concentration. Moreover, experimental results and comparison with proper rate equations modelling showed a linear dependence of the photoluminescence emission intensity for the Yb3+ ions 2F5/22F7/2 transition at 980 nm on the excitation power, indicating a direct transfer process from Tb3+ to Yb3+ ions. The reported waveguides could find applications not only as downconverting filters in transmission but also as efficient solar concentrators in the near-IR spectral region

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 193, 44-50 p.
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Experimental physics
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URN: urn:nbn:se:ltu:diva-65172DOI: 10.1016/j.jlumin.2017.08.027ISI: 000415827200010OAI: oai:DiVA.org:ltu-65172DiVA: diva2:1134050
Note

Validerad;2017;Nivå 2;2017-11-22 (andbra)

Available from: 2017-08-17 Created: 2017-08-17 Last updated: 2017-12-14Bibliographically approved

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