Spatially correlated charge transport in organic thin film transistors

Year: 2004

Authors: Dinelli F., Murgia M., Levy P., Cavallini M., de Leeuw D., Biscarini F.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Ist. Stud. dei Mat. Nanostrutturati, Sezione Bologna, Via P. Gobetti 101, I-40129 Bologna, Italy; Philips Research Laboratory, Prof. Holstlaan 4, 5656 AA Eindhoven, Netherlands; Departamento de Fisica, Centro Atómico Constituyentes, CNEA, Buenos Aires, Argentina

Abstract: 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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 91 (11)      Pages from: 116082-1  to: 116082-4

More Information: We thank J.-F. Moulin, C. Taliani, G. Cardinali, ?>U. Valbusa, L. Molenkamp, V. Wagner, G. Horowitz. This work is supported by EU G5RD-CT2000-00349 MONA-LISA. P.?L. was supported by ICTP-TRIL.
KeyWords: FIELD-EFFECT TRANSISTORS; ELECTRICAL CHARACTERISTICS; ALPHA-SEXITHIENYL; SCALING BEHAVIOR; SINGLE-CRYSTALS; SEXITHIOPHENE; MOBILITY; TEMPERATURE; VOLTAGE; GROWTH
DOI: 10.1103/PhysRevLett.92.116802

Citations: 558
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