Collecting the electrons on n-doped fullerene C60 transparent conductors for all-vacuum-deposited small-molecule organic solar cells

n-Doped C60 is reported as a new electrode material for indium-tin-oxide-free organic solar cells. All layers from the bottom to top electrode are prepared in one step in a vacuum chamber. The organic solar cells based on the n-C60 electrodes assisted by a semitransparent metal grid exhibit efficiencies as high as 2.9%.