A European proficiency test on thin-film tandem photovoltaic devices by Elena Salis, Andreas Gerber, Jens Wenzel Andreasen, Suren A. Gevorgyan, Tom Betts, Blagovest Mihaylov, Ralph Gottschalg, Alp Osman Kodolbaş, Okan Yilmaz, Roman Leidl, Marcus Rennhofer, Shokufeh Zamini, Maurizio Acciarri, Simona Binetti, Erwin Lotter, Klaas Bakker, Jan Kroon, Wim Soppe, Guillaume Razongles, Lucia V. Mercaldo, Francesco Roca, Antonio Romano, Jochen Hohl-Ebinger, Wilhelm Warta, José L. Balenzategui, Juan F. Trigo, Sebastian Neubert, Diego Pavanello, Harald Müllejans, Iver Lauermann

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