1. Research Institute for Advanced Electronics and Photonics, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
2. Department of Applied Physics, The University of Tokyo, Hongo, Tokyo 113-8656, Japan
3. Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
4. Research Center for Organic Electronics, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
5. Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
6. RIKEN SPring-8 Center, Kouto, Sayo, Hyogo 679-5148, Japan
7. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan
8. Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan