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- W2966884023 abstract "To fully optimize devicesfor solar energy conversion, a comprehensive understanding of how excitonsmigrate in materials for solar cell devices is crucial. Understanding themechanisms behind exciton diffusion and energy transfer will enable thefabrication of highly efficient devices. However to thoroughly study excitonproperties, techniques implementing high spatial (nm sizes) and temporal (fstime scales) resolution is required. Herein, we utilize transient absorptionmicroscopy (TAM) with 50 nm spatial resolution and 200 fs temporal resolutionto elucidate exciton diffusion in polymeric materials for solar energyconversion.While organic devices areinexpensive and require simpler fabrication procedures than inorganicmaterials, their device efficiencies often suffer due to their semi-crystallinenature, lending to short diffusion lengths which lead to trap sites and inevitablyrecombination. It has been demonstrated that achieving long-range exciton diffusionlengths is possible through coherence effects. Coherence can be found in anintermediate electronic coupling region where delocalization and localization compete.To exploit coherence effects,we study polymeric systems in which polymer chains are highly aligned viasimple and scalable procedures; semiconducting fibers and solution coated films.In studying the fiber, we first implement polarized photoluminesce (PL) todetermine optical ansitropy. From the polarized PL and PL images, it isobserved that emission intensities are largest when probing along the transitiondipole moment of the polymer. This suggests a type of Forester Resonance Energy Transfer mechanismin which excitons hop from one polymer chain to another.Solution coated polymer filmsare also studied to understand exciton diffusion as a function of depositionmethods. By varying the solution concentration as well as coating rate, we areable to tune the morphology of the film. We observe a strong dependence betweendiffusion constant and deposition parameters, with diffusion constants of ca. 9, 13 and33 cm2/s for three different films. The results obtained in this thesis arepreliminary steps in an effort to elucidate energy transfer mechanisms and rates." @default.
- W2966884023 created "2019-08-22" @default.
- W2966884023 creator A5004290280 @default.
- W2966884023 date "2019-08-12" @default.
- W2966884023 modified "2023-09-28" @default.
- W2966884023 title "Energy Transfer and Optical Anisotropy in Semiconducting Polymers" @default.
- W2966884023 doi "https://doi.org/10.25394/pgs.8940275.v1" @default.
- W2966884023 hasPublicationYear "2019" @default.
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