The cost-effective production of flexible electronic components will profit considerably from the development of solution-processable, organic semiconductor materials. Particular attention is focused on soluble semiconductors for organic field-effect transistors (OFETs). The hitherto differentiation between "small molecules" and polymeric materials no longer plays a role, rather more the ability to process materials from solution to homogeneous semiconducting films with optimal electronic properties (high charge-carrier mobility, low threshold voltage, high on/off ratio) is pivotal. Key classes of materials for this purpose are soluble oligoacenes, soluble oligo- and polythiophenes and their respective copolymers, and oligo- and polytriarylamines. In this context, micro- or nanocrystalline materials have the general advantage of somewhat higher charge-carrier mobilities, which, however, could be offset in the case of amorphous, glassy materials by simpler and more reproducible processing.
Die kostengünstige Fertigung flexibler elektronischer Bauelemente dürfte in Zukunft stark von der Entwicklung aus Lösung prozessierbarer, organischer Halbleitermaterialien profitieren. Besondere Aufmerksamkeit gilt dabei zurzeit löslichen Halbleitern für organische Feldeffekttransistoren (OFETs). Die bis vor einiger Zeit vorgenommene Trennung zwischen “kleinen Molekülen” und polymeren Materialien spielt mittlerweile keine Rolle mehr – entscheidend ist vielmehr die Verarbeitbarkeit der Materialien aus Lösung zu homogenen Halbleiterschichten mit optimalen elektronischen Eigenschaften (hohe Ladungsträgermobilität, geringe Schwellspannung, hohes An/Aus‐Verhältnis). Die Materialien der Wahl sind hier lösliche Oligoacene, lösliche Oligo‐ und Polythiophene oder entsprechende Copolymere sowie Oligo‐ und Polytriarylamine. Mikro‐ oder nanokristalline Materialien bieten dabei allgemein den Vorteil etwas höherer Ladungsträgermobilitäten; amorphe, glasartige Materialien könnten dies jedoch durch eine einfachere und besser reproduzierbare Verarbeitung wettmachen.
In this contribution, we present the synthesis and characterization of poly[9-(4-alkylphenyl)carbazole-3,6-diyl] and poly[1,3-bis(3'-alkylcarbazole-9'-yl)-5-alkylphenylene-6',6″-diyl]. The amorphous solid state structure, reasonably good field effect mobility and on/off ratios of these novel carbazole-based polymers make them promising candidates as hole conducting materials for printed organic field-effect transistors (OFETs).
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