Eur. Phys. J. Appl. Phys.
Volume 55, Number 2, August 2011
International Symposium on Flexible Organic Electronics 2010 (ISFOE)
|Number of page(s)||4|
|Published online||11 August 2011|
Impurity-related vibrational modes in a pentacene crystal
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
2 Department of Physics, National Technical University of Athens, Athens, Greece
3 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
a e-mail: email@example.com
Accepted: 30 May 2011
Published online: 11 August 2011
The presence of impurities in the molecular crystals of organic semiconductors is a key limiting factor for the performance of related electronic devices. For this reason, the atomic-scale details of impurity incorporation are important elements for modeling and optimization of organic electronic systems. In this article, we use first-principles density-functional theory calculations to describe the vibrational spectrum of typical impurity culprits in the prototype organic semiconductor pentacene. First, we validate the computational approach by comparing results on vibrational modes of impurity-free pentacene with available theoretical and experimental data. We then analyze the effect of oxygen, water, and hydrogen impurities on the modes of pentacene crystals. The results identify distinct impurity-related features which can help understand the evolution of impurities in pentacene samples.
© EDP Sciences, 2011
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