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1.
  • Enrichi, Francesco, et al. (författare)
  • Silver doping of silica-hafnia waveguides containing Tb3+/Yb3+ rare earths for downconversion in PV solar cells
  • 2016
  • Ingår i: Optical materials (Amsterdam). - : Elsevier BV. - 0925-3467 .- 1873-1252. ; 60, s. 264-269
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to study the possibility to obtain an efficient downconverting waveguide which combines the quantum cutting properties of Tb3+/Yb3+ codoped materials with the optical sensitizing effects provided by silver doping. The preparation of 70SiO(2)-30HfO(2) glass and glass-ceramic waveguides by sol-gel route, followed by Ag doping by immersion in molten salt bath is reported. The films were subsequently annealed in air to induce the migration and/or aggregation of the metal ions. Results of compositional and optical characterization are given, providing evidence for the successful introduction of Ag in the films, while the photoluminescence emission is strongly dependent on the annealing conditions. These films could find potential applications as downshifting layers to increase the efficiency of PV solar cells
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2.
  • Righini, Giancarlo C., et al. (författare)
  • Light management in solar cells : Recent advances
  • 2017
  • Konferensbidrag (refereegranskat)abstract
    • Efficient light management is critical for the enhancement of the efficiency of solar cells. The performance of a solar cell is determined by the efficiency of the absorption process of light via excitation of electron-hole pairs and extraction of these generated charge carriers. The absorption, in turn, has a few limiting factors: one is related to the small size and acceptance angle of the active region, another to the reduced spectral sensitivity of the active material, which does not use a part of the solar radiation. Correspondingly, the energy harvesting may be improved in two ways: a) light trapping schemes may be adopted to make the cell 'thicker' by exploiting scattering and/or reflection effects. Plasmonic structures, constituted by patterned metal films or nanoparticles, demonstrated to be very effective for directing and enhancing the incident light beam. b) up- and down-conversion processes may be exploited to convert the frequencies of the solar spectrum from near-mid-IR and from blue-UV regions, respectively, to the region of maximum absorption of the cell. Thin glassy or glass-ceramic films doped with rare earth ions proved to be very suitable for this purpose. Here, an overview of recent results achieved in the use of plasmonic structures by different research groups will be reported, and different approaches will be compared.
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