1. School
of Chemistry and Biochemistry, and Center for Organic Photonics and
Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
2. School
of Materials Science and Engineering, and Center for Organic Photonics
and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
3. Department
of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Naval
Research Laboratory, 4555
Overlook Avenue, Washington, D.C. 20375, United States