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Kompensationsdotierung und Dotandenmigration in organischen Feldeffekt-Transistoren by Barf, Marc-Michael

Kompensationsdotierung und Dotandenmigration in organischen Feldeffekt-Transistoren

by Marc-Michael Barf
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Book cover type: Paperback
  • ISBN13: 9783750417595
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Bod - Books on Demand
  • Publisher Imprint: Bod - Books on Demand
  • Publication Date:
  • Pages: 148
  • Original Price: USD 54.9
  • Language: German
  • Edition: N/A
  • Item Weight: 186 grams
  • BISAC Subject(s): Physics / Condensed Matter

Die Aussicht auf eine kostengünstige Massenproduktion flexibler elektrischer Bauteile hat organischen Halbleitern wie dem weitverbreiteten konjugierten Polymer P3HT in den letzten Jahren viel Beachtung zukommen lassen. Eine Anwendung gerade dieses gut synthetisierbaren und prozessierbaren Materials in organischen Feldeffekt-Transistoren (OFETs) blieb dabei jedoch bislang aufgrund seiner Instabilität an Luft stark eingeschränkt. Die unerwünschte p-Dotierung des Polymers durch Sauerstoff konnte in dieser Arbeit mit Hilfe molekularer n-Dotanden kompensiert werden. Hierdurch wurde das durch die Sauerstoff-Dotierung reduzierte On/Off-Verhältnis der OFETs deutlich vergrö ert. Allerdings verschlechterten sich zeitgleich Feldeffekt-Mobilität sowie Schwellenspannung der Bauteile und ihre Transfercharakteristik wies eine zunehmende Hysterese auf, was auf den Drift der verwendeten n-Dotanden in ihnen zurückgeführt werden konnte. Innerhalb von Halbleiter-Filmen konnte ein Dotanden-Drift dabei anhand einfacher elektrischer Messungen nachverfolgt werden. Anschlie ende Untersuchungen mit hinzugegebenen isolierenden Polymeren offenbarten, dass diese jenen Drift in Halbleiter-Filmen potentiell unterdrücken können. Für die Anwendung in OFETs erwiesen sie sich jedoch aufgrund einer tendenziell ungünstigen Morphologie im Zusammenspiel mit n-dotiertem P3HT als ungeeignet. Letztendlich konnte der Dotanden-Drift in Transistoren durch eine chemische Modifikation der verwendeten n-Dotanden unterbunden werden. Über die Funktionalisierung mit einer Azidgruppe konnte eine kovalente Bindung zwischen Dotand und Halbleiter und somit eine Immobilisierung der Dotanden im Bauteil erreicht werden, wodurch dort die negativen Auswirkungen ihres Drifts abgewendet werden konnten. Wie reine P3HT-OFETs zeigten an Luft prozessierte und charakterisierte Bauteile mit immobilisierten n-Dotanden kaum Hysterese, eine für dieses Material hohe Feldeffekt-Mobilität sowie eine niedrige Schwellenspannung. Der alleini

Marc-Michael Barf wurde am 16. Oktober 1991 in Mannheim geboren. Nach dem Studium der Physik am Karlsruher Institut für Technologie promovierte er an der Technischen Universität Braunschweig auf dem Gebiet der Organischen Elektronik.

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