3 ans

Black Silicon-based meta-materials: characterization of thermal and energy exchanges at interfaces

[TheChamp-Sharing]
Offre de thèse à compter du 01.10.2022, avec financement sur 3 ans

While the scientific literature has so far mainly focused on the optical properties of BSi, we will focus in this
thesis on its thermal and radiative properties for heat management in electronic components, for example. This
thesis will be the continuation of an exploratory project I-Site FUTURE « CATBSI » which ends in June 2022, the
preliminary results of which relating to the characterization of the conductive properties of BSi samples are
encouraging.
Two scientific and technological objectives must be addressed to address this issue:
1) Fabrication of new types of metamaterials based either on i) thin layers (from a few nanometers to a
few micrometers) of BSi on substrates based on semiconductors, polymers or phase change materials; or on ii) BSibased
nanocomposites with nano-inclusions of carbon nanotubes, graphene and diamond. This type of
functionalization has already proven to be suitable for improving optical properties.16 The manufacturing of BSibased
materials will mainly be carried out in the clean rooms of the University Gustave Eiffel/ESIEE Paris.
2) Design and implementation of new experimental techniques for the characterization of the metamaterials
fabricated in phase 1. For thermal applications (rectification, cooling, or other),17 it will be interesting to
study the temperature dependence of the different thermophysical properties of the considered materials. These
properties being so far mainly studied at room temperature, a systematic characterization of their temperature
dependence is necessary. The study of their thermal and optical properties will be based on the implementation of
a measurement of thermal conductivity by the 3-omega method and a design of an experimental bench for the
measurement of emissivity by spectroscopy and microscopy, FTIR. The experimental results will then be combined
with theoretical/numerical simulations (e.g., by finite elements) to extract the expected properties. The objective
Université Gustave Eiffel • Campus de Marne-la-Vallée
5, Boulevard Descartes • Champs-sur-Marne • 77454 Marne-La-Vallée CEDEX 2
will be to provide solutions to improve heat transport at interfaces and thus control heat transfer (conductive and
radiative).

Georges HAMAOUI - Contacter
Champs-sur-Marne (77)

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