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CPP: Chemische Physik und Polymerphysik

CPP 19: SYMPOSIUM Functional Organic Thin Films I

CPP 19.2: Vortrag

Donnerstag, 30. März 2006, 10:00–10:15, ZEU Lich

Optimized hole injection with strong electron acceptors at organic-metal interfaces — •Norbert Koch¹, Steffen Duhm¹, Antje Vollmer², Robert L. Johnson³, and Jürgen P. Rabe¹ — ¹Humboldt-Universität zu Berlin, Institut f. Physik, Newtonstr. 15, 12489 Berlin — ²BESSY GmbH, 12489 Berlin — ³Universität Hamburg, Institut f. Experimentalphysik, 22761 Hamburg

The energy level alignment at interfaces between three electroactive conjugated organic materials and Au was systematically varied by adjusting the pre-coverage of the metal substrate with the electron acceptor tetrafluoro-tetracyanoquinodimethane (F4-TCNQ). Photoelectron spectroscopy revealed that electron transfer from Au to adsorbed F4-TCNQ was responsible for lowering the hole-injection barrier by as much as 1.2 eV. This novel interface modification scheme is independent of the charge transfer complex formation ability of the organic materials with the electron acceptor.