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Channels of oxygen diffusion in single crystal rubrene revealed

Thompson, RJ; Bennett, T; Fearn, S; Kamaludin, M; Kloc, C; McPhail, DS; Mitrofanov, O; (2016) Channels of oxygen diffusion in single crystal rubrene revealed. Physical Chemistry Chemical Physics , 18 (47) pp. 32302-32307. 10.1039/c6cp05369f. Green open access

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Abstract

Electronic devices made from organic materials have the potential to support a more ecologically friendly and affordable future. However, the ability to fabricate devices with well-defined and reproducible electrical and optical properties is hindered by the sensitivity to the presence of chemical impurities. Oxygen in particular is an impurity that can trap electrons and modify conductive properties of some organic materials. Until now the 3-dimensional profiling of oxygen species in organic semiconductors has been elusive and the effect of oxygen remains disputed. In this study we map out high-spatial resolution 3-dimensional distributions of oxygen inclusions near the surface of single crystal rubrene, using Time of Flight Secondary Ion Mass Spectroscopy (ToF-SIMS). Channels of diffused oxygen are found extending from uniform oxygen inclusion layers at the surface. These channels extend to depths in excess of 1.8 μm and act as an entry point for oxygen to diffuse along the ab-plane of the crystal with at least some of the diffused oxygen molecularly binding to rubrene. Our investigation of surfaces at different stages of evolution reveals the extent of oxygen inclusion, which affects rubrene's optical and transport properties, and is consequently of importance for the reliability and longevity of devices.

Type: Article
Title: Channels of oxygen diffusion in single crystal rubrene revealed
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c6cp05369f
Publisher version: http://dx.doi.org/10.1039/c6cp05369f
Language: English
Additional information: This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Keywords: Science & Technology, Physical Sciences, Chemistry, Physical, Physics, Atomic, Molecular & Chemical, Chemistry, Physics, ORGANIC SEMICONDUCTORS, GROWTH
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1506532
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