Publication date: 21st July 2025
Optoelectronic applications such as solar cells and photodetectors require precise control over the separation and extraction of photoexcited charges. Colloidal semiconductor nanocrystals are promising for next-generation devices because they are cost-effective, solution-processable, and offer broad tunability compared to epitaxially grown semiconductors. Nanocrystal materials are inherently heterogeneous, with variations of nanocrystal size and macroscopic structure that strongly influence charge transport. These heterogeneities generate complex diffusion dynamics that govern how carriers move, separate, and recombine within the nanocrystal network. Linking the material’s structure, its degree of heterogeneity, and the resulting carrier dynamics is essential for optimizing performance. Device-level efficiency ultimately depends on how microscopic carrier motion translates into macroscopic charge extraction. This poster presents pump–probe optical measurements combined with modeling and Kinetic Monte-Carlo simulations to investigate charge-carrier dynamics in nanocrystal-based optoelectronic devices, providing insight into how material design and heterogeneity control transport processes and guide the development of more efficient next-generation optoelectronic technologies.
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