1. Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
2. Organic and Carbon Electronics Laboratories (ORaCEL), North Carolina State University, Raleigh, North Carolina 27695, United States
3. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
4. Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843, United States
5. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, United States