1. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
2. Molecular Engineering & Sciences Institute, University of Washington, Seattle, Washington 98195, United States
3. Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
4. pi-Conjugated Polymers Unit, Okinawa Institute of Science and Technology, Onna-son, Okinawa 904-0495, Japan