Dual roles of MoO₃-doped pentacene thin films as hole-extraction and multicharge-separation functions in pentacene/C₆₀ heterojunction organic solar cells

The authors demonstrate a pentacene/C₆₀ heterojunction organic solar cell utilizing MoO₃-doped pentacene thin films as an interfacial layer at anode and a multicharge-separation layer between pentacene and C₆₀, respectively. The short-circuit current density and the open-circuit voltage were improved simultaneously compared with the reference device, resulting in an improvement in power conversion efficiency from 0.97% to 2.29%. Absorption spectra measurement, surface morphology analysis, and interfacial evaluation at anode side in the hole-dominant devices were carried out to reveal the functions of MoO₃-doped pentacene films in OSCs.