▎ 摘　　要

Graphene is an ideal substitute for indium tin oxide electrode in organic photovoltaic (OPV) devices, due to its outstanding electrical, optical, chemical and mechanical properties. However, the graphene electrode suffers from work function mismatch with common hole injection layer and intrinsic hydrophobic property. Here, CuxO is proposed to modify monolayer graphene in order to increase the work function of graphene (from 4.45 to 4.76 eV) and decrease the water contact angle (from 88 degrees to 59 degrees). Then, the OPV devices based on the CuxO modified graphene anode arc fabricated successfully, and power conversion efficiency (PCE) is enhanced from 4.00 +/- 0.44 to 5.23 +/- 0.47%. Furthermore, the ternary blended polymer solar cell is fabricated by adding a small molecular material 1, 2, 5-thiadiazole-fused 12-ring polyaromatic hydrocarbon into the active layer, and the PCE is improved to 6.03 +/- 0.53%, due to the enhanced absorption and depressed recombination inside the active layer. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement