1. Catalonia Institute for Energy Research, IREC, Jardins de les Dones de Negre 1, 08930, Sant Adrià de Besòs, Barcelona, Spain
2. University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland
3. National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba 1-1-1, Chuo Daisan Chuo Honkan 1F, Tsukuba, Japan
4. Institute of Microelectronics of Barcelona, IMB-CNM (CSIC), C/Til·lers s/n, Campus UAB, Bellaterra, 08193, Barcelona, Spain
5. ICREA, Passeig de Llúis Companys, 23, 08010 Barcelona, Spain
6. Swiss Nanoscience Institute, SNI, Klingelbergstrasse 82, 4056, Basel, Switzerland