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<p class="MsoNormal" style="background:white"><b><span lang="en-NL" style="color:black">Title:</span></b><span lang="en-NL" style="color:black">
<i>Excitons in motion: linking structure and transport in sustainable energy materials</i></span><span lang="en-NL"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span lang="en-NL" style="color:black">Abstract:
</span></b><span lang="en-NL" style="color:black">"As the global demand for sustainable energy grows, understanding how light-driven energy is transported in materials becomes increasingly important. This talk will explore how exciton diffusion
<span style="background:white">—</span> central to processes like photovoltaics and photosynthesis
<span style="background:white">—</span> is influenced by material properties such as dimensionality, defects, and molecular geometry. Using spatiotemporal microscopy techniques, I will investigate exciton dynamics in diverse systems, from organic semiconductors
and 2D perovskites to TMDCs and bio-inspired assemblies. Key findings reveal that structural factors significantly enhance or hinder exciton mobility: reduced dimensionality improves diffusion in molecular films used in organic photovoltaics, while defects
and environmental interactions shape multiple transport regimes in TMDCs.<b><o:p></o:p></b></span></p>
<p class="MsoNormal" style="background:white"><span lang="en-NL" style="color:black">A central focus of the talk will be the influence of molecular packing density in bio-inspired systems. Using StrEET, a novel technique developed in 2024 in our group — capable
of measurements at fluences 10,000 times lower than previous methods and at illumination levels below natural sunlight — we achieved the first direct measurement of exciton diffusion in these systems. I will introduce a study on LH2 from Purple Bacteria and
porphyrins as a model for BChl-c from Green Sulfur Bacteria. In both cases, increasing molecular packing density enhances the diffusion coefficient while shortening the exciton lifetime. The optimal diffusion length emerges from a delicate balance between
these competing effects, offering guiding principles for designing artificial light-harvesting systems inspired by natural processes and advancing our understanding of nature itself."<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="en-NL" style="color:black"><br>
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When: Thursday 8th May, 1 pm<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="en-NL" style="color:black">where: Spectrum 5, on the 2<sup>nd</sup> floor of the VO Building (de Boelelaan 1100) <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span lang="en-NL" style="color:black">Speaker: Giulia Lo Gerfo ICFO, Barcelona, Spain<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="en-NL" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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