Exciton Quantum Dynamics in pi-Conjugated Polymers Probed by Two-Dimensional Coherent Excitation Spectroscopy
Gutierrez Meza, Elizabeth
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In organic semiconductors, there is a great interest in seeking a detailed picture of the exciton dynamics and how it depends on the molecular properties. The strong correlation between polymer optoelectronic properties and their structure, is manifested through the spectral line shapes. They encode valuable information about primary photoexcitations, exciton spatial coherence properties and the nature of the disordered energy landscape. One approach to disclose this information is through spectroscopy as it allows to explore short-range interactions that dictate the intrinsic material properties. In this thesis, we study the exciton quantum dynamics, specifically the dephasing which is a very sensitive probe of the system bath coupling, we also map many-body electronic correlations which play a significant role in semiconductor properties. To achieve this, is necessary to use a technique that can detect optical coherences before they dissipate by the exciton environment. In this sense, two-dimensional coherent spectroscopy is a unique tool to measure dephasing and population dynamics. We use this spectroscopic technique to examine the exciton dynamics in polymeric microstructures.