1. Department of Materials Science and Engineering and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USA
2. Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USA
3. King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Division of Physical Sciences and Engineering Thuwal 23955‐6900 Saudi Arabia
4. Department of Chemistry University of North Carolina at Chapel Hill Chapel Hill NC 27599 USA
5. Department of Mechanical and Aerospace Engineering and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh NC 27695 USA