Abstract
A new electron transport mechanism through cathode buffer in organic solar cells is proposed with the inverted structure of indium-tin oxide (cathode)/very thin Ag layer (cathode*)/bathocuproine (BCP, buffer)/fullerene/copper phthalocyanine/pentacene/Ag (anode). Electron transport across the BCP occurs not through defect states, but over the LUMO (lowest unoccupied molecular orbital). The electron conductivity is sensitive to the cathode work function (WFc). As WFc is lower, the energy difference between the BCP LUMO and the cathode Fermi level is smaller. This introduces low electronic potential barrier. The low WFc is important to achieve low series resistance.
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