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Optimisation de cellules solaires en silicium amorphe hydrogéné pour intégration sur photobioréacteurs

Abstract : One of the main limitations of microalgae culture is the low efficiency of sunlight conversion. If the culture takes place in a closed medium, a photobioreactor, another limitation is the energy consumption. Semi-transparent solar cells technologies only absorb a part of the incident light to produce electricity while being transparent in a specific wavelength range. This will allow the photosynthesis needed for microalgae growth. To improve the overall photoconversion efficiency and provide energy support, a photobioreactor (PBR) and photovoltaic technology (PV) coupled system can be developed. Thin film solar cells based on hydrogenated amorphous silicon technology could be directly placed on the PBR surface. The first step to reach this objective is to enhance the solar cell transparency by 3% by means of a design of experiment which redefine the thicknesses of thin layers. A homemade growing test of G. sulphuraria shows that PV optical filtering does not influence the growth rate. The PV efficiency of these cells is then improved by means of optical treatments of substrates surfaces obtained by reactive ion etching. An antireflection texture with light scattering effect gives better results and the efficiency increases to 5.2 %. In a second step, the technology is adapted to a flexible substrate. The deposition step of amorphous silicon was optimized in order to obtain solar cells on PEN with a PV efficiency of 2.1%. The final part of this study focuses on the analysis of the results obtained in this thesis from concrete cases of PBR integrated into buildings in order to calculate the performance of a PV/PBR/Building system. The technologies developed in this work would make it possible to fully meet the energy demand of biofacades without damaging the growth of microalgae.
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Submitted on : Saturday, December 5, 2020 - 4:48:16 AM
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Agathe Brodu. Optimisation de cellules solaires en silicium amorphe hydrogéné pour intégration sur photobioréacteurs. Matériaux. Université de Limoges, 2020. Français. ⟨NNT : 2020LIMO0051⟩. ⟨tel-03041565⟩

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