Berlin 2008 – wissenschaftliches Programm
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.38: Poster
Dienstag, 26. Februar 2008, 14:30–20:00, Poster A
Comparison of high mobility P3HT and pBTTT semiconducting polymers — •Silviu Botnaras1, Arne Hoppe1, Benedikt Gburek1, Martin Heeney2, and Veit Wagner1 — 1Jacobs University Bremen, School of Engineering and Science, 28725 Bremen, Germany — 2Centre for Materials Research, Queen Mary University of London, London E1 4NS, UK
Polythiophenes are well known for their semiconducting properties and for their application in organic electronic devices such as thin film transistors or organic solar cells. Due to the possibility of low-temperature solution-processing and high charge carrier mobility these polymers are possible candidates for large area commercial applications. Regioregular poly(3-hexylthiophene) (rr-P3HT) with reported charge carrier mobilities larger than 0.1 cm2/Vs has been well established as a polymeric model system in the last years. One disadvantage of P3HT, however, is the low stability under ambient conditions. Within the last two years a new class of polymers emerged with even higher mobilities and increased air stability: Polythienothiophenes. We report on a study of poly(2,5-bis(3-alkylthiophen-2yl)thieno[3,2-b]thiophene) (pBTTT) with reported charge carrier mobilities up to 0.6 cm2/Vs. We found charge carrier mobilities larger than 0.1 cm2/Vs for solution processed devices on silicon dioxide as insulating layer. A comparison of the pBTTT and P3HT devices is presented with respect to air stability, contact properties and functionality on silicon and polymeric substrates. The analysis demonstrates the superior properties for pBTTT.