1. Research
Center for Photovoltaic Technologies, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1, 305-8568 Higashi, Tsukuba, Japan
2. JST-PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, 332-0012 Kawaguchi, Saitama, Japan