1. Heeger Center for Advanced Materials and Research Institute for Solar and Sustainable Energies
2. Gwangju Institute of Science and Technology
3. Gwangju 61005
4. Republic of Korea
5. Department of Chemistry and Centre for Plastic Electronics
6. State Key Laboratory of Polymer Physics
7. Chinese Academy of Sciences
8. Beijing 100190
9. China
10. Imperial College London
11. London W12 0BZ
12. UK
13. Pohang Accelerator Laboratory (PAL)
14. Pohang University of Science and Technology (POSTECH)
15. Pohang 790-784