1. Laboratory of Organic Electronics, Linköping University, Norrköping, Sweden
2. Center for Functional Sensor & Actuator (CFSN) and International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Japan
3. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan