| Autor: |
Akkerman HB; Department of Chemical Engineering, Stanford University, Stauffer III, 381 North-South Mall, Stanford, California 94305-5025, USA., Mannsfeld SC, Kaushik AP, Verploegen E, Burnier L, Zoombelt AP, Saathoff JD, Hong S, Atahan-Evrenk S, Liu X, Aspuru-Guzik A, Toney MF, Clancy P, Bao Z |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of the American Chemical Society [J Am Chem Soc] 2013 Jul 31; Vol. 135 (30), pp. 11006-14. Date of Electronic Publication: 2013 Jul 22. |
| DOI: |
10.1021/ja400015e |
| Abstrakt: |
Because of their preferential two-dimensional layer-by-layer growth in thin films, 5,5'bis(4-alkylphenyl)-2,2'-bithiophenes (P2TPs) are model compounds for studying the effects of systematic chemical structure variations on thin-film structure and morphology, which in turn, impact the charge transport in organic field-effect transistors. For the first time, we observed, by grazing incidence X-ray diffraction (GIXD), a strong change in molecular tilt angle in a monolayer of P2TP, depending on whether the alkyl chain on the P2TP molecules was of odd or even length. The monolayers were deposited on densely packed ultrasmooth self-assembled alkane silane modified SiO2 surfaces. Our work shows that a subtle change in molecular structure can have a significant impact on the molecular packing structure in thin film, which in turn, will have a strong impact on charge transport of organic semiconductors. This was verified by quantum-chemical calculations that predict a corresponding odd-even effect in the strength of the intermolecular electronic coupling. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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