1. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
2. Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
3. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
4. Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom
5. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
6. pi-Conjugated Polymers Unit, Okinawa Institute of Science and Technology, Onna, Okinawa 904-0495, Japan
7. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
8. Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States