1. Department of Physics and Centre for Processable Electronics, Imperial College London, South Kensington, UK
2. Department of Chemistry and Centre for Processable Electronics, Imperial College London, 82 Wood Lane, London, UK
3. Department of Chemistry, University of Glasgow, University Avenue, Glasgow, UK
4. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R, China
5. Department of Engineering, The Open University, Walton Hall, Milton Keynes, UK
6. SPECIFIC IKC, College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea, UK