1. Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California Santa Barbara (UCSB), Santa Barbara, California 93106, United States
2. School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
3. Materials Science and Engineering, University of Colorado, Boulder, Colorado 80309, United States
4. Renewable and Sustainable Energy Institute, University of Colorado Boulder, Boulder, Colorado 80303, United States
5. Department of Physics, School of Sciences and Humanities, Nazarbayev University, 010000 Astana, Republic of Kazakhstan
6. Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309, United States