BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Structural Order\, Crystallinity\, and Processing Effects in Organ ic Semiconducting Systems DTSTART:20261113T093000Z DTEND:20261113T120000Z DTSTAMP:20261002T234947Z UID:edbfb69f-e2d6-4edc-a25d-d8cc7e8025d9 SEQUENCE:2 CREATED:20261002T084849Z DESCRIPTION:Organic photovoltaic devices have attracted significant intere st as lightweight\, flexible\, and solution-processable renewable-energy t echnologies. Their performance is strongly influenced by the morphological organization of the active layer\, which affects charge photogeneration\, transport\, recombination\, and collection processes. Understanding how s pecific structural and processing-related characteristics influence device behavior therefore remains an important topic within organic electronics. This thesis investigates the influence of highly ordered interfaces\, cry stallinity\, and processinginduced morphological modifications on the opto electronic behavior of organic semiconducting systems through the study of deliberately simplified and well-defined model structures. In this contex t\, three complementary research topics were investigated. The first resea rch topic investigated the influence of crystal-crystal interface formatio n in highly ordered rubrene-based systems\, revealing enhanced conductivit y and charge transport associated with crystalline interfacial effects. Th e second study explored the incorporation of a rubrene single-crystal dono r within planar heterojunction organic solar cells\, demonstrating efficie nt photovoltaic generation at crystalline donor/acceptor interfaces and pr oviding insight into the role of highly ordered donor phases. Finally\, th e third research topic evaluated the replacement of conventional halogenat ed solvents by green-solvent alternatives in Y12-based planar heterojuncti on solar cells\, showing that green-solvent processing modifies active-lay er nanoscale organization while producing comparable or enhanced photocurr ent generation. By investigating simplified model systems exhibiting disti nct forms of structural order and processing-induced morphological variati on\, this work contributed to the understanding of morphology-related effe cts in organic semiconducting heterojunctions and provided additional insi ght into the relationship between structural organization and optoelectron ic behavior in organic semiconducting systems LAST-MODIFIED:20261002T084858Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/structural-order-crystalli nity-and-processing-effects-in-organic-semiconducting-systems/ X-ALT-DESC;FMTTYPE=text/html:

Organic photovoltai c devices have attracted significant interest as lightweight\, flexible\, and solution-processable renewable-energy technologies. Their performance is strongly influenced by the morphological organization of the active lay er\, which affects charge photogeneration\, transport\, recombination\, an d collection processes. Understanding how specific structural and processi ng-related characteristics influence device behavior therefore remains an important topic within organic electronics.

This thesis investig ates the influence of highly ordered interfaces\, crystallinity\, and proc essinginduced morphological modifications on the optoelectronic behavior o f organic semiconducting systems through the study of deliberately simplif ied and well-defined model structures. In this context\, three complementa ry research topics were investigated. The first research topic investigate d the influence of crystal-crystal interface formation in highly ordered r ubrene-based systems\, revealing enhanced conductivity and charge transpor t associated with crystalline interfacial effects.

The second st udy explored the incorporation of a rubrene single-crystal donor within pl anar heterojunction organic solar cells\, demonstrating efficient photovol taic generation at crystalline donor/acceptor interfaces and providing ins ight into the role of highly ordered donor phases. Finally\, the third res earch topic evaluated the replacement of conventional halogenated solvents by green-solvent alternatives in Y12-based planar heterojunction solar ce lls\, showing that green-solvent processing modifies active-layer nanoscal e organization while producing comparable or enhanced photocurrent generat ion.

By investigating simplified model systems exhibiting distin ct forms of structural order and processing-induced morphological variatio n\, this work contributed to the understanding of morphology-related effec ts in organic semiconducting heterojunctions and provided additional insig ht into the relationship between structural organization and optoelectroni c behavior in organic semiconducting systems

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