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Energy-level alignment at strongly coupled organic-metal interfaces

DOI: 10.1088/1361-648X/ab0171 DOI Help

Authors: Meng-ting Chen (Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University) , Oliver T. Hofmann (Institute of Solid State Physics, TU Graz) , Alexander Gerlach (Eberhard Karls Universitat Tubingen Institut fur Angewandte Physik) , Benjamin Bröker (Institut für Physik, Humboldt Universitaet zu Berlin) , Christoph Buerker (Institut fur Angewandte Physik, Universitaet Tuebingen) , Jens Niederhausen (Helmholtz-Zentrum Berlin fur Materialien und Energie) , Takuya Hosokai (National Institute of Advanced Industrial Science and Technology (AIST)) , Jorg Zegenhagen (Diamond Light Source) , Antje Vollmer (Helmholtz-Zentrum Berlin fur Materialien und Energie) , Ralph Rieger (Max-Planck-Institut fur Polymerforschung) , Klaus Muellen (Max-Planck-Institut fuer Polymerforschung) , Frank Schreiber (Institut fur Angewandte Physik, Universitaet Tuebingen) , Ingo Salzmann (Concordia University) , Norbert Koch (Institut für Physik, Humboldt Universitaet zu Berlin) , Egbert Zojer (Institut fuer Festkorperphysik, Technischen Universitaet Graz) , Steffen Duhm (Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Condensed Matter

State: Published (Approved)
Published: January 2019

Open Access Open Access

Abstract: Energy-level alignment at organic-metal interfaces plays a crucial role for the performance of organic electronic devices. However, reliable models to predict energetics at strongly coupled interfaces are still lacking. We elucidate contact formation of 1,2,5,6,9,10-coronenehexone (COHON) to the (111)-surfaces of coinage metals by means of ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, the X-ray standing wave technique, and density functional theory calculations. While for low COHON thicknesses, the work-functions of the systems vary considerably, for thicker organic films Fermi-level pinning leads to identical work functions of 5.2 eV for all COHON-covered metals irrespective of the pristine substrate work function and the interfacial interaction strength.

Journal Keywords: X-ray standing waves; density functional theory; energy-level alignment; organic-metal interface; photoelectron spectroscopy

Subject Areas: Physics

Facility: ESRF; BESSY II

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