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2010-03-18 - Article/Dans un journal avec peer-review - Anglais - 11 page(s)

Lemaur Vincent , Bouzakraoui Said, Olivier Yoann , Brocorens Patrick , Burhin C., El Beghdadi J., Martin-Hoyas A., Jonas A.M., Serban D.A., Vlad A., Boucher N., Leroy J., Sferrazza Michèle, Melinte S., Sergeev S., Geerts Yves, Lazzaroni Roberto , Cornil Jérôme , Nysten B., "Structural and Charge-Transport Properties of a Liquid-Crystalline a,w-Disubstituted Thiophene Derivative: A Joint Experimental and Theoretical Study" in Journal of Physical Chemistry. C, Nanomaterials and interfaces, 114, 10, 4617-4627

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : Chimie structurale (DI1317), Physique de l'état solide (DI1261), Chimie quantique (DI1321)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) We present a joint experimental and theoretical study of the structural and charge-transport properties of a liquid-crystalline a,?-disubstituted oligothiophene derivative for application in organic field-effect transistors. The structural properties of the crystalline and smectic phases are investigated by atomic force microscopy, X-ray reflectometry, and X-ray diffraction. To complement these data, molecular mechanics calculations together with the simulation of X-ray diffraction spectra were performed to determine the relative positions of the molecules in the unit cell. The electrical characteristics of field-effect transistors based on the oligothiophene derivative were measured and compared in the crystalline and smectic phases. Although the silanation of the SiO2 gate dielectric promoted a marked improvement in the charge-carrier mobilities in the crystalline phase, the expected suppression of grain boundaries in the liquid-crystalline phase was not unambiguously evidenced. The experimental results we e further complemented by a detailed theoretical analysis of the electronic couplings governing the charge-transport properties on the molecular scale.

Notes :
  • (Anglais) Publié en ligne le 19 février 2010
Identifiants :
  • DOI : 10.1021/jp9070423