Barrier formation at organic interfaces in a Cu(100)-benzenethiolate-pentacene heterostructure |
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Authors: | Betti M G Kanjilal A Mariani C Vázquez H Dappe Y J Ortega J Flores F |
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Affiliation: | Dipartimento di Fisica, Università di Roma La Sapienza, P. le Aldo Moro 2, I-00185 Roma, Italy. |
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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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