Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3571286
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- DFG [SPP1355]
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We investigated the energy levels at organic heterojunctions comprising the donor diindenoperylene (DIP) on top of the acceptor C(60) with photoelectron spectroscopy. The intermolecular interaction is weak as evidenced on a moderate work function electrode by a small interface dipole of 0.15 eV and flat energy levels on both sides of the junction. When a high work function electrode is used, the DIP levels become Fermi-level pinned and an electric field drops within the C(60) layer underneath. The electric field distribution within an organic opto-electronic device may thus be adjusted by employing interfacial energy level pinning, even at physisorptive organic/organic interfaces. (c) 2011 American Institute of Physics. [doi:10.1063/1.3571286]
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