1. Molecular Materials and Nanosystems and Institute for Complex Molecular Systems Eindhoven University of Technology P.O. Box 513 Eindhoven 5600 MB The Netherlands
2. Department of Physics and Organic and Carbon Electronics Lab (ORaCEL) North Carolina State University Raleigh NC 27695 USA
3. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
4. Energy Engineering Zuyd University of Applied Sciences Nieuw Eyckholt 300 Heerlen 6419 DJ The Netherlands
5. Dutch Institute for Fundamental Energy Research De Zaale 20 Eindhoven 5612 AJ The Netherlands
6. Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China