1. Department of Chemistry Education Graduate Department of Chemical Materials Sustainable Utilization of Photovoltaic Energy Research Center Institute for Plastic Information and Energy Materials Pusan National University Busan 46241 Republic of Korea
2. Department of Materials Science and Engineering Seoul National University Seoul 151–744 Republic of Korea
3. Organic Optoelectronic Device Laboratory (OODL) Department of Information Display Kyung Hee University Seoul 02447 Republic of Korea
4. Division of Industrial Metrology Korea Research Institute of Standards and Science (KRISS) Daejeon 34113 Republic of Korea