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:20261002T234954Z UID:edbfb69f-e2d6-4edc-a25d-d8cc7e8025d9 SEQUENCE:1 CREATED:20261002T084840Z DESCRIPTION: Organic photovoltaic devices have attracted significant inter est as lightweight\, flexible\, and solution-processable renewable-energy technologies. Their performance is strongly influenced by the morphologica l organization of the active layer\, which affects charge photogeneration\ , transport\, recombination\, and collection processes. Understanding how specific structural and processing-related characteristics influence devic e behavior therefore remains an important topic within organic electronics . This thesis investigates the influence of highly ordered interfaces\, cr ystallinity\, and processinginduced morphological modifications on the opt oelectronic behavior of organic semiconducting systems through the study o f deliberately simplified and well-defined model structures. In this conte xt\, three complementary research topics were investigated. The first rese arch topic investigated the influence of crystal-crystal interface formati on in highly ordered rubrene-based systems\, revealing enhanced conductivi ty and charge transport associated with crystalline interfacial effects. T he second study explored the incorporation of a rubrene single-crystal don or within planar heterojunction organic solar cells\, demonstrating effici ent photovoltaic generation at crystalline donor/acceptor interfaces and p roviding insight into the role of highly ordered donor phases. Finally\, t he third research topic evaluated the replacement of conventional halogena ted solvents by green-solvent alternatives in Y12-based planar heterojunct ion solar cells\, showing that green-solvent processing modifies active-la yer nanoscale organization while producing comparable or enhanced photocur rent generation. By investigating simplified model systems exhibiting dist inct forms of structural order and processing-induced morphological variat ion\, this work contributed to the understanding of morphology-related eff ects in organic semiconducting heterojunctions and provided additional ins ight into the relationship between structural organization and optoelectro nic behavior in organic semiconducting systems LAST-MODIFIED:20261002T084840Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/en/events/structural-order-crystallin ity-and-processing-effects-in-organic-semiconducting-systems/ X-ALT-DESC;FMTTYPE=text/html:

Organic photovolta ic 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 la yer\, which affects charge photogeneration\, transport\, recombination\, a nd collection processes. Understanding how specific structural and process ing-related characteristics influence device behavior therefore remains an important topic within organic electronics.

This thesis investi gates the influence of highly ordered interfaces\, crystallinity\, and pro cessinginduced morphological modifications on the optoelectronic behavior of organic semiconducting systems through the study of deliberately simpli fied and well-defined model structures. In this context\, three complement ary research topics were investigated. The first research topic investigat ed the influence of crystal-crystal interface formation in highly ordered rubrene-based systems\, revealing enhanced conductivity and charge transpo rt associated with crystalline interfacial effects.

The second s tudy explored the incorporation of a rubrene single-crystal donor within p lanar heterojunction organic solar cells\, demonstrating efficient photovo ltaic generation at crystalline donor/acceptor interfaces and providing in sight into the role of highly ordered donor phases. Finally\, the third re search topic evaluated the replacement of conventional halogenated solvent s by green-solvent alternatives in Y12-based planar heterojunction solar c ells\, showing that green-solvent processing modifies active-layer nanosca le organization while producing comparable or enhanced photocurrent genera tion.

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

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