1. Department of Materials Science, Faculty of Pure and Applied Sciences, and Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
2. Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology,
P.O. Box 513, Eindhoven 5600 MB, The Netherlands
3. Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands
4. Leibniz Institute of Photonic Technology, Albert-Einstein Straße 9, 07745 Jena, Germany
5. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Helmholtzweg 4, D-07743 Jena, Germany
6. Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Road, Nankang District, Taipei 11529, Taiwan
7. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan