Electronic Structure of the Buried Interface Between an Organic Semiconductor, N,N′-Bis(3-methylphenyl)-N,N′-Diphenylbenzidine (TPD), and Metal Surfaces

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Abstract:

The electronic structures of buried interfaces between an organic semiconductor, N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) and metal surfaces of Au, Ag, Al and Ca were examined by the new experimental method that we have developed recently. In this method the energy levels at the organic/metal interface can be examined without changing the film thickness and related physical parameters e.g., the vacuum levels of the sample in contrast to the widely-used thickness-dependent photoemission experiments. The results were discussed in view of large interfacial dipole moment of the TPD and metal (Au and Ag) contacts.

Keywords: BURIED INTERFACE; ENERGY LEVEL ALIGNMENT; ORGANIC SEMICONDUCTOR; PHOTOEMISSION SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.5401

Publication date: January 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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