Layer-by-layer graphene/TCNQ stacked films as conducting anodes for organic solar cells

Chang Lung Hsu, Cheng Te Lin, Jen Hsien Huang, Chih Wei Chu, Kung Hwa Wei*, Lain-Jong Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

180 Scopus citations

Abstract

Figure Persented: 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 (∼2.58%), which makes the proposed anode film quite attractive for next-generation flexible devices demanding high conductivity and transparency.

Original languageEnglish (US)
Pages (from-to)5031-5039
Number of pages9
JournalACS Nano
Volume6
Issue number6
DOIs
StatePublished - Jun 26 2012

Keywords

  • TCNQ
  • doping
  • graphene anodes
  • layer-by-layer
  • organic photovoltaic cell
  • organic solar cell
  • transparent conducting electrodes

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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