a Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstrasse 2, 79110 Freiburg, Germany,
b Centre for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW), Helmholtzstrasse 8, 89081 Ulm, Germany,
c NEXT ENERGY • EWE Research Centre for Energy Technology, Carl-von-Ossietzky-Strasse 15, 26129 Oldenburg, Germany
d European Commission, Directorate-General Joint Research Centre (JRC), Institute for Energy and Transport (IET), Westerduinweg 3, 1755 Petten, The Netherlands