New functional polythiophene based materials: fine-tuning of photovoltaic or chiroptical properties

Marinelli, Martina (2020) New functional polythiophene based materials: fine-tuning of photovoltaic or chiroptical properties, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Chimica, 32 Ciclo. DOI 10.48676/unibo/amsdottorato/9353.
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There is a remarkable level of interest in the development of π-conjugated polymers (ICPs) which have been employed, thanks to their promising optical and electronic properties, in numerous applications including photovoltaic cells, light emitting diodes and thin-film transistors. Although high power conversion efficiency can be reached using poly(3-alkylthiophenes) (P3ATs) as electron-donating materials in polymeric solar cells of the Bulk-Heterojunction type (BHJ), their relatively large band gap limits the solar spectrum fraction that can be utilized. The research work described in this dissertation thus concerns the synthesis, characterization and study of the optical and photoactivity properties of new organic semiconducting materials based on polythiophenes. In detail, various narrow band gap polymers and copolymers were developed through different approaches and were characterized by several complementary techniques, such as gel permeation chromatography (GPC), NMR spectroscopy, thermal analyses (DSC, TGA), UV-Vis/PL spectroscopy and cyclic voltammetry (CV), in order to investigate their structural and chemical/photophysical properties. Moreover, the polymeric derivatives were tested as active material in air-processed organic solar cells. The activity has also been devoted to investigate the behavior of polythiophenes with chiral side chain, that are fascinating materials capable to assume helix supramolecular structures, exhibiting optical activity in the aggregated state.

Tipologia del documento
Tesi di dottorato
Marinelli, Martina
Dottorato di ricerca
Settore disciplinare
Settore concorsuale
Parole chiave
Conjugated polymers; organic solar cells; SMOSCs; D-A polymers; alkoxy alkyl substituents; regioregular polythiophenes; electron-donating chiral side chains; optical activity; circular dichroism; block copolymers; Suzuki catalyst transfer condensative polymerization.
Data di discussione
1 Aprile 2020

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