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THESIS DEFENSE OF Hugo LAVAL - November 6, 2024

Hugo LAVAL will defend his thesis on november6, 2024 at 09:00 am at ENSMAC – Amphi 3 (16 avenue Pey Berland – Pessac), on the subject : Control of organic semiconductor nanoparticles morphology for water‑processable photovoltaic solar cells.

In order to improve the sustainability of the organic photovoltaics, the use of toxic solvents for processing organic solar cells needs to be replaced

with cleaner alternatives, such as water. As most organic semiconductors are not soluble in water, the strategy to overcome this constrain is to form

nanoparticles from these materials, that are thus able to be dispersed in water. This work aims to understand and overcome the limitations arising

from the internal morphology of nanoparticles dispersed in water, as well as the challenges in their film-forming process. In particular, the influence of

materials proprieties such as the surface energy and alkyl side chains on the process and performances of water-processed organic solar cells was studied.

As a result, world record efficiencies exceeding 10% were achieved, thus opening the way to efficient eco-friendly organic photovoltaics.

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