Open AccessCopper oxide-modified graphene anode and its application in organic photovoltaic cells
Author(s) -
Min Wang,
Hongtao Yu,
Xiaoxue Ma,
Yao Yao,
Liang Wang,
Lihui Liu,
Kun Cao,
Shuli Liu,
Chen Dong,
Baomin Zhao,
Chunyuan Song,
Shufen Chen,
Wei Huang
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.00a769
Subject(s) - graphene , materials science , organic solar cell , anode , energy conversion efficiency , work function , indium tin oxide , oxide , optoelectronics , electrode , graphene oxide paper , active layer , graphene foam , layer (electronics) , nanotechnology , chemical engineering , polymer , composite material , thin film transistor , chemistry , engineering , metallurgy
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, Cu x O 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° to 59°). Then, the OPV devices based on the Cu x O modified graphene anode are 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.