Enhanced Vertical Charge Transport in a Semiconducting P3HT Thin Film on Single Layer Graphene
2015 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 25, no 5, 664-670 p.Article in journal (Refereed) Published
The crystallization and electrical characterization of the semiconducting polymer poly(3-hexylthiophene) (P3HT) on a single layer graphene sheet is reported. Grazing incidence X-ray diffraction revealed that P3HT crystallizes with a mixture of face-on and edge-on lamellar orientations on graphene compared to mainly edge-on on a silicon substrate. Moreover, whereas ultrathin (10 nm) P3HT films form well oriented face-on and edge-on lamellae, thicker (50 nm) films form a mosaic of lamellae oriented at different angles from the graphene substrate. This mosaic of crystallites with - stacking oriented homogeneously at various angles inside the film favors the creation of a continuous pathway of interconnected crystallites, and results in a strong enhancement in vertical charge transport and charge carrier mobility in the thicker P3HT film. These results provide a better understanding of polythiophene crystallization on graphene, and should help the design of more efficient graphene based organic devices by control of the crystallinity of the semiconducting film.
Place, publisher, year, edition, pages
2015. Vol. 25, no 5, 664-670 p.
graphene, organic semiconductor, P3HT, crystallization, charge transport
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:umu:diva-100760DOI: 10.1002/adfm.201403418ISI: 000349225400001OAI: oai:DiVA.org:umu-100760DiVA: diva2:807933