A photoemission study of interfaces between organic semiconductors and Co as well as Al2O3/Co contacts

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Grobosch, M. and Schmidt, C. and Naber, W.J.M. and Wiel, W.G. van der and Knupfer, M. (2010) A photoemission study of interfaces between organic semiconductors and Co as well as Al2O3/Co contacts. Synthetic Metals, 160 (3-4). pp. 238-243. ISSN 0379-6779

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Abstract:We have studied the energy-level alignment of ex situ, acetone cleaned Co and Al2O3/Co contacts to the organic semiconductors pentacene and rubrene by combined X-ray and ultraviolet photoemission spectroscopy. Our results demonstrate that the work function under these conditions is smaller than in the in situ cleaned, atomically clean case. Moreover, the studied interfaces are characterized by very small, short range interfaces dipoles and substantial injection barriers for holes. This represents essential information in view of their use in organic spintronic devices. Our core-level photoemission spectroscopy measurements rule out chemical reactions.
Item Type:Article
Copyright:© 2010 Elsevier
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/75547
Official URL:http://dx.doi.org/10.1016/j.synthmet.2009.09.014
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