Efficient and Stable Air-Processed Ternary Organic Solar Cells Incorporating Gallium-Porphyrin as an Electron Cascade Material oleh Anastasia Soultati, Maria Verouti, Ermioni Polydorou, Konstantina-Kalliopi Armadorou, Zoi Georgiopoulou, Leonidas C. Palilis, Ioannis Karatasios, Vassilis Kilikoglou, Alexander Chroneos, Athanassios G. Coutsolelos, Panagiotis Argitis, Maria Vasilopoulou