Our researchers with collaboration of colleagues from MRL laboratory and IJS scientists, found a novel and efficient method used to improve carrier mobilities of poly(3-hexylthiophene) (P3HT)-based organic field effect transistors by means of nanowire formation. The treatment, termed solvation, consists of depositing a small quantity of a solvent directly on top of a previously deposited semiconducting film, and allowing the solvent to evaporate slowly. Such treatment results in an increase of the saturation mobility by more than one order of magnitude, from 1.3 × 10−3 up to 3.4 × 10−2 cm2/Vs, while devices preserve their high ON/OFF ratio of ∼104. The atomic force and scanning electron microscopy studies show that solvated P3HT layers develop a network of nanowires, which exhibit increased degree of structural order, as demonstrated by micro Raman spectroscopy. The time-of-flight photoconductivity studies suggest that higher hole mobility stems from a reduced energy disorder of the transporting states in these structures. More can be found in this paper.
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Head of Laboratory
prof. dr. Gvido Bratina
Contact: Vesna Mržek
E-mail: vesna.mrzek@ung.si
Tel.: + 386 5 3653 500
Fax: + 386 5 3653 527
Address:
Laboratory of Organic Matter Physics
Vipavska cesta 11c
SI-5270 Ajdovščina
Slovenia Europe Meta