Elaboration et caractérisation de films d'oxynitrure de silicium dopés cérium et ytterbium : applications aux diodes électroluminescentes et au découpage quantique pour les cellules solaires

Abstract : This thesis is dedicated to cerium doped and cerium-ytterbium co doped oxynitride silicon films optical applications grown by radio frequency magnetron sputtering. Growth parameters have been optimized in order to obtain a strong cerium emission visible to the naked eye in the matrix host SiOxNy, especially the nitrogen flux has a dominant role. We showed that cerium ions have a high solubility without clustering at very high annealing temperature (1200°C). Those excellent properties lead to a first application: the elaboration of blue LED. First results show a weak electroluminescence signal but are still encouraging for further study. The second application is the elaboration of frequency conversion layers to increase the efficiency of Si based solar cell. Indeed solar cell are limited by the mismatch between the solar spectrum and the cell absorption range. The elaboration of Ce/Yb co doped SiOxNy films to convert a UV photon (300-400 nm) into two infrared photons (980 nm) allows to overcome the solar cell theoretical limit. Layers grown show an Yb3+ ion emission in presence of Ce3+ ions in the host matrix SiOxNy. Ce3+ ions sensitize Yb3+ ions on a large spectral range and their cooperative energy transfer mechanism is detailed. An efficiency of 185% is obtained for the higher dopants atomic concentration. In order to improve this system, the effect of adding Bragg mirrors placed between the conversion layer and the silicon substrate, which represents the solar cell, is theoretically studied. Their aim is double: increase the maximum flux of UV photons trapped in the frequency conversion layer and transmit a maximum of infrared photons, which are easily absorbable, toward the solar cell.
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-01729037
Contributor : Abes Star <>
Submitted on : Monday, March 12, 2018 - 12:06:07 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:30 PM
Long-term archiving on : Wednesday, June 13, 2018 - 1:25:35 PM

File

2017-EHRE-FLORIAN-VO.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01729037, version 1

Citation

Florian Ehré. Elaboration et caractérisation de films d'oxynitrure de silicium dopés cérium et ytterbium : applications aux diodes électroluminescentes et au découpage quantique pour les cellules solaires. Physique [physics]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMC260⟩. ⟨tel-01729037⟩

Share

Metrics

Record views

353

Files downloads

60