1. Organic Nanoelectronics Laboratory; Department of Chemical Engineering; School of Applied Chemical Engineering; Kyungpook National University; Daegu 41566 South Korea
2. Center for Plastic Electronics; Department of Physics; Blackett Laboratory; Imperial College London; London SW7 2AZ UK
3. Research Institute of Advanced Energy Technology; Kyungpook National University; Daegu 41566 South Korea
4. Department of Chemistry; Division of Advanced Materials Science; Pohang University of Science and Technology; Pohang 37673 South Korea
5. Polymer Chemistry Laboratory; College of Engineering; Kyungil University; Gyeongsan 38428 South Korea
6. Departments of Engineering Science and Physics; Division of Mathematical; Physical and Life Sciences; University of Oxford; Oxford OX1 3PD UK