Barrier Formation at Organic Interfaces in a Cu(100)-benzenethiolate-pentacene Heterostructure

M. G. Betti, A. Kanjilal, C. Mariani, H. Vázquez, Y. J. Dappe, J. Ortega, and F. Flores
Phys. Rev. Lett. 100, 027601 – Published 15 January 2008

Abstract

The energy level alignment at the metal-organic and organic-organic interfaces of the Cu(100)/benzenethiolate/pentacene heterostructure is studied by photoemission spectroscopy and discussed theoretically using a model that includes, in a consistent way, charge transfer, Pauli repulsion, intrinsic molecular dipoles, and interface screening as a function of coverage. Despite the different nature of the two interfaces, our model provides a unified explanation for the work-function changes at both junctions and enables us to determine the benzenethiolate orientation as a function of coverage.

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  • Received 5 July 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.027601

©2008 American Physical Society

Authors & Affiliations

M. G. Betti1, A. Kanjilal2,1, C. Mariani1, H. Vázquez3,4, Y. J. Dappe3, J. Ortega3, and F. Flores3

  • 1Dipartimento di Fisica, Università di Roma “La Sapienza”, P. le Aldo Moro 2, I-00185 Roma, Italy
  • 2INFM-CNR Center on nanoStructures and bioSystems at Surfaces (S3), Via G. Campi 231/A, I-41100 Modena, Italy
  • 3Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Spain
  • 4MIC-Dept. of Micro and Nanotechnology, Technical University of Denmark, DTU, DK-2800 Lyngby, Denmark

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Vol. 100, Iss. 2 — 18 January 2008

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