Spatially Correlated Charge Transport in Organic Thin Film Transistors

Franco Dinelli, Mauro Murgia, Pablo Levy, Massimiliano Cavallini, Fabio Biscarini, and Dago M. de Leeuw
Phys. Rev. Lett. 92, 116802 – Published 19 March 2004

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.

  • Figure
  • Figure
  • Figure
  • Received 4 March 2002

DOI:https://doi.org/10.1103/PhysRevLett.92.116802

©2004 American Physical Society

Authors & Affiliations

Franco Dinelli, Mauro Murgia, Pablo Levy*, Massimiliano Cavallini, and Fabio Biscarini

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

Dago M. de Leeuw

  • Philips Research Laboratory, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands

  • *Permanent address: Departamento de Fisica, Centro Atómico Constituyentes, CNEA, Buenos Aires, Argentina.
  • Electronic address: f.biscarini@ism.bo.cnr.it

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 92, Iss. 11 — 19 March 2004

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×