Figure 1From: Hafnium metallocene compounds used as cathode interfacial layers for enhanced electron transfer in organic solar cellsThe structure of the solar cell and the chemical structure of the ECHD. (a) A schematic drawing of an organic solar cell structure with a bis-(ethylcyclopentadienyl) hafnium(IV) dichloride cathode interfacial layer. (b) The chemical structure of the bis-(ethylcyclopentadienyl) hafnium(IV) dichloride.Back to article page