Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PhD : selection by topics

Engineering science >> Optics - Laser optics - Applied optics
2 proposition(s).

Photovoltaic and hybrid solar components for buildings optimized for the aesthetics and the performance.

Département des Technologies Solaires (LITEN)

Laboratoire Composants d'Enveloppe du Bâtiment

01-10-2019

SL-DRT-19-0632

ya-brigitte.assoa@cea.fr

In order to obtain Nearly Zero-Energy Buildings (NZEB), a total coverage of energy needs is possible thanks to solar energy. These buildings must also allow a complete management of the interior comfort and offer a successful aesthetics in compliance with the requirements of the architects. These three points ask for an optimal integration of multifunctional solar photovoltaic (BIPV) or photovoltaic / thermal hybrid components (BIPV/T). This thesis aims at researching a BIPV (/T) component for facade combining aesthetics and performance according to an optimized architectural approach. Indeed, the integration of PV modules into facade leads to a decrease in energy efficiency compared to a rack-mounted PV system due, among others, to their overheating, to the risk of shading in urban areas and to the coloring technique used to obtain a particular aesthetic. The goal is ultimately to define and validate a design methodology of solar components with predefined color and aspect providing a maximum energy output. The thesis will consist in the numerical analysis and the experimental study of global solutions optimizing the electric conversion efficiency and improving the thermal performance (convection and radiation). A performance prediction model of an optimized BIPV(/T) facade will be developed and validated.

Design, fabrication and characterization of microlasers for data communications

Département d'Optronique (LETI)

Laboratoire de Photonique pour les Communications et le Calcul

01-10-2019

SL-DRT-19-0676

karim.hassan@cea.fr

Needs for high speed datacommunications has increased tremendously these last years. Optical links, usually used for long distance communications, are now used for shorter distances in data centers, for instance between racks or within a rack. Components for Si photonics are excellent candidates for these short distances communications has there are low cost and highly performant. Moreover, CMOS fabrication environment brings excellent fabrication yield, and test/packaging capabilities. Nevertheless, Si, being an indirect bandgap material, cannot emit light, thus, laser are generally fabricated using a IIIV material (direct bandgap material, i. e. InP) added to the Si photonics circuit. CEA/Leti expertise in transfer layer technologies is used to bond IIIV material on Si photonics circuits leading to fully integrated devices. This phD work aims at developing new solutions for the design and fabrication of micro lasers adapted to very short communications (inter or intra dies). These new devices relie on a CMOS compatible fabrication process flow and original design. The phD student will be in charge of (i) microlasers design using the available softwares in the laboratory, (ii) microlasers fabrication relying on CEA/Leti technological platform and (iii) electro-optically characterization of these new components.

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