Self-Diffusion of pentacene on graphite in the sub-monolayer regime studied with quasi-elastic neutron scattering (QENS).
Organic thin films such as pentacene (C22H14) films are promising systems for the development of novel electronic devices. However, the electrical properties of the resulting devices are limited by the quality of the films, which strongly depends on the growth process. Thus, understanding the mechanisms which govern diffusion is essential to set the most favorable conditions for growing well-ordered epitaxial organic thin films on technologically relevant substrates. Quasi-elastic neutron scattering is an excellent tool to investigate both the self- and the collective diffusion of polyclyclic aromatic hydrocarbons (PAH) such as pentacene. We aim to survey the self-diffusion of pentacene molecules adsorbed on exfoliated graphite to complement the measurements of the collective diffusion to be carried out on deuterated pentacene (C22D14) with neutron spin-echo (the spin-echo beam time has already been allocated on IN11). The goal is to identify the physical mechanisms, which drive the first layer formation, at the atomic scale, in a weakly physisorbed phase.
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CALVO ALMAZAN Irene; FOUQUET Peter; HEDGELAND Holly; MUTKA Hannu and ZBIRI Mohamed. (2015). Self-Diffusion of pentacene on graphite in the sub-monolayer regime studied with quasi-elastic neutron scattering (QENS).. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-452
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