1. Department of Chemistry, Loughborough University, Epinal Way, LE11 3TU, UK
2. Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK
3. Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland
4. Advanced Light Source, Lawrence Berkeley National Laboratory, Cyclotron Road, Berkeley, CA, 94720, USA
5. Yusuf Hamied Department of Chemistry, Cambridge, CB2 1EW, UK
6. Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Ellison Place, Newcastle upon Tyne, NE1 8ST, UK