1. Department of Physics Durham University Durham DH1 3LE UK
2. Organic Semiconductor Centre EaStCHEM School of Chemistry University of St Andrews St Andrews KY16 9ST UK
3. Laboratory for Chemistry of Novel Materials University of Mons Mons 7000 Belgium
4. School of Chemistry University of Leeds Woodhouse Lane Leeds LS2 9JT UK
5. Laboratory for Computational Modeling of Functional Materials Namur Institute of Structured Matter Université de Namur Rue de Bruxelles, 61 Namur 5000 Belgium