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Phys Rev Lett. 2004 Mar 19;92(11):116802. Epub 2004 Mar 19.

Spatially correlated charge transport in organic thin film transistors.

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  • 1Consiglio Nazionale delle Ricerche--Istituto per lo Studio dei Materiali Nanostrutturati-Sezione Bologna, Via P. Gobetti 101, I-40129 Bologna Italy.


Hole mobility in organic ultrathin film field-effect transistors is studied as a function of the coverage. For layered sexithienyl films, the charge carrier mobility rapidly increases with increasing coverage and saturates at a coverage of about two monolayers. This shows that the first two molecular layers next to the dielectric interface dominate the charge transport. A quantitative analysis of spatial correlations shows that the second layer is crucial, as it provides efficient percolation pathways for carriers generated in both the first and the second layers. The upper layers do not actively contribute either because their domains are smaller than the ones in the second layer or because the carrier density is negligible.

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