1. CSIRO Energy, Newcastle, NSW 2300, Australia
2. Centre for Organic Electronics, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia
3. Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
4. Department of Physics, College of Education
for Pure Science, University of Anbar, Ramadi 31001, Iraq
5. Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson
Lakes, SA 5095, Australia
6. Department of Chemistry and Chemical Engineering/Polymer
Technology, Chalmers University of Technology, 41296 Göteborg, Sweden