Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 10, Pages 4617-4627Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9070423
Keywords
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Funding
- Region Wallone via the ETIQUEL
- Science Policy Office of the Belgian Federal Government [PA16/27]
- FNRS-FRFC
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We present,I joint experimental and theoretical study of the structural and charge-transport properties of a liquid-crystalline alpha,omega-disustituted oligothiopliene derivative for application ill 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 oil 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 char-c-carrier mobilities in the crystalline Phase, the expected suppression of grain boundaries ill the liquid-crystalline phase was not unanibiguously evidenced. The experimental results were further complemented by a detailed theoretical analysis of the electronic couplings governing the charge-transport properties oil the molecular scale.
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