Title: Layer-by-Layer Graphene/TCNQ Stacked Films as Conducting Anodes for Organic Solar Cells
Authors: Hsu, Chang-Lung
Lin, Cheng-Te
Huang, Jen-Hsien
Chu, Chih-Wei
Wei, Kung-Hwa
Li, Lain-Jong
Department of Materials Science and Engineering
Keywords: graphene anodes;transparent conducting electrodes;organic solar cell;organic photovoltaic cell;layer-by-layer;doping;TCNQ
Issue Date: 1-Jun-2012
Abstract: Large-area graphene grown by chemical vapor deposition (CVD) is a promising candidate for transparent conducting electrode applications in flexible optoelectronic devices such as light-emitting diodes or organic solar cells. However, the power conversion efficiency (PCE) of the polymer photovoltaic devices using a pristine CVD graphene anode is still not appealing due to its much lower conductivity than that of conventional indium tin oxide. We report a layer-by-layer molecular doping process on graphene for forming sandwiched graphene/tetracyanoquinodimethane (TCNQ)/graphene stacked films for polymer solar cell anodes, where the TCNQ molecules (as p-dopants) were securely embedded between two graphene layers. Poly(3-hexylthiophene)/phenyl-C61-butyric acid methyl ester (P3HT/PCBM) bulk heterojunction polymer solar cells based on these multilayered graphene/TCNQ anodes are fabricated and characterized. The P3HT/PCBM device with an anode structure composed of two TCNQ layers sandwiched by three CVD graphene layers shows optimum PCE (similar to 2.58%), which makes the proposed anode film quite attractive for next-generation flexible devices demanding high conductivity and transparency.
URI: http://hdl.handle.net/11536/16492
ISSN: 1936-0851
Journal: ACS NANO
Volume: 6
Issue: 6
End Page: 5031
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