Avoiding ambient air and light induced degradation in high-efficiency polymer solar cells by the use of hydrogen-doped zinc oxide as electron extraction material - Polydorou, E.; Sakellis, I.; Soultati, A.; Kaltzoglou, A.; Papadopoulos, T.A.; Briscoe, J.; Tsikritzis, D.; Fakis, M.; Palilis, L.C.; Kennou, S.; Argitis, P; P. Falaras; et al. (2017)