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Proceedings Paper

Organic field-effect transistors with solution-processible thiophene/phenylene based-oligomer derivative films
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Paper Abstract

Solution-processible thiophene/phenylene -based oligomer derivatives with different end substituents are presented as p-type semiconducting materials in OFETs. These films were deposited on OTS-treated SiO2/Si or polymeric bivinyltetramethyldisiloxane-bis(benzocyclobutene) (BCB)/ITO/quartz substrates, via drop-casting and spin-casting. Synchrotron-based grazing-incidence X-ray diffraction and atomic force microscopy reveals that both drop- and spin-cast films have highly crystalline structures with edge-on molecules and parallel π-π stacking conjugated planes with respect to the substrate. In particular, temperature-dependent solubility of these materials can give a strategy for highly ordered crystalline structure in spin-cast films grown on cooler substrates, when compared to warmed solutions. Field-effect mobilities of these spin-cast films in a top-contacted electrode OFETs with BCB dielectrics are reached as high as ~0.01 cm2/Vs.

Paper Details

Date Published: 13 September 2007
PDF: 6 pages
Proc. SPIE 6658, Organic Field-Effect Transistors VI, 66581A (13 September 2007); doi: 10.1117/12.733953
Show Author Affiliations
Hoichang Yang, Rensselaer Polytechnic Institute (United States)
Jason Locklin, Univ. of Georgia (United States)
Birendra Singh, Johannes Kepler Univ. of Linz (Austria)
Zhenan Bao, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 6658:
Organic Field-Effect Transistors VI
Zhenan Bao; David J. Gundlach, Editor(s)

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