People | Locations | Statistics |
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Ferrari, A. |
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Schimpf, Christian |
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Dunser, M. |
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Thomas, Eric |
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Gecse, Zoltan |
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Tsrunchev, Peter |
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Della Ricca, Giuseppe |
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Cios, Grzegorz |
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Hohlmann, Marcus |
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Dudarev, A. |
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Mascagna, V. |
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Santimaria, Marco |
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Poudyal, Nabin |
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Piozzi, Antonella |
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Mørtsell, Eva Anne |
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Jin, S. |
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Noel, Cédric |
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Fino, Paolo |
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Mailley, Pascal |
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Meyer, Ernst |
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Zhang, Qi |
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Pfattner, Raphael | Brussels |
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Kooi, Bart J. |
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Babuji, Adara |
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Pauporte, Thierry |
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Rahmani, M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2023Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 TeV
- 2023Treatment of a Food Industry Dye, Brilliant Blue, at Low Concentration Using a New Photocatalytic Configurationcitations
- 2022Search for new physics in the lepton plus missing transverse momentum final state in proton-proton collisions at √s=13 TeVcitations
- 2015Temporal Broadening of Attosecond Photoelectron Wavepackets From Solid Surfacescitations
- 2012Emission mechanisms in stabilized iron-passivated porous silicon: Temperature and laser power dependencescitations
- 2009Homogenization of Moisture Diffusing Behavior of Composite Materials with Impermeable or Permeable Fibers ; Homogenization of Moisture Diffusing Behavior of Composite Materials with Impermeable or Permeable Fibers: Application to Porous Composite Materialscitations
Places of action
article
Emission mechanisms in stabilized iron-passivated porous silicon: Temperature and laser power dependences
Abstract
International audience ; Photoluminescence (PL) measurements of porous silicon (PS) and iron-porous silicon nanocomposites (PS/Fe) with stable optical properties versus temperature and laser power density have been investigated. The presence of iron in PS matrix is confirmed by Raman spectroscopy. The PL intensity of PS and PS/Fe increases at low temperature, the evolution of integrated PL intensity follows the modified Arrhenius model. The incorporation of iron in PS matrix reduces the activation energy traducing the existence of shallow levels related to iron atoms. Also, the temperature dependence of the porous silicon PL peak position follows a linear evolution at high temperature and a quadratic one at low temperature. Such evolution is due to the thermal carriers' redistribution and an energy transfer. Similarly, we have compared the laser power dependence of the PL in PS and PS/Fe layers. The results prove that the recombination process in PS is realised through the lower energy traps localised in the electronic gap. However, the observed emission in PS/Fe is essentially due to direct transitions. So, we can conclude that the presence of iron in PS matrix induces a strong modification of the PL mechanisms.