The application of highly doped single-layer graphene as the top electrodes of semitransparent organic solar cells

Zhike Liu, Jinhua Li, Zhen Hua Sun, Guoan Tai, Shu Ping Lau, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

273 Citations (Scopus)

Abstract

Figure Persented: A single-layer graphene film with high conductance and transparency was realized by effective chemical doping. The conductance of single-layer graphene was increased for more than 400% when it was doped with Au nanoparticles and poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid). Then semitransparent organic solar cells based on poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) were fabricated with single-layer graphene and indium tin oxide (ITO) as the top and bottom electrodes, respectively. The performance of the devices was optimized by tuning the active layer thickness and doping the single-layer graphene electrodes. The maximum efficiency of 2.7% was observed in the devices with the area of 20 mm 2 illuminated from graphene electrode under the AM1.5 solar simulator. It is notable that all of the devices showed higher efficiency from the graphene than ITO side, which was attributed to the better transmittance of the graphene electrodes. In addition, the influence of the active area of the organic solar cell on its photovoltaic performance was studied. We found that, when the active areas increased from 6 to 50 mm 2, the power conversion efficiencies decreased from 3% to 2.3% because of the increased series resistances and the decreased edge effect of the devices.
Original languageEnglish
Pages (from-to)810-818
Number of pages9
JournalACS Nano
Volume6
Issue number1
DOIs
Publication statusPublished - 24 Jan 2012

Keywords

  • conductance
  • doping
  • field effect transistor
  • grapheme
  • organic solar cell
  • PEDOT:PSS

ASJC Scopus subject areas

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

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