Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 18, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0953-8984/20/18/184008
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The fundamental physical and chemical phenomena that can occur at interfaces between conjugated organic molecules and metal surfaces are discussed. The adsorption strength of molecular monolayers on metals covers a wide range from the weak physisorption regime to strong chemisorption, involving charge transfer and/or covalent bond formation. In many cases, molecular conformation changes can be observed, which directly impact the interface electronic structure and charge injection across the organic/metal contact. The energy level positions of organic multilayers are essentially determined by the monolayer/metal interaction, and 'flat-band' conditions prevail for thicker layers of pure organic molecules. Consequently, thermodynamic equilibrium across organic semiconductor films may not always be established.
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