Enhanced photovoltaic properties and long-term stability in plasmonic dye-sensitized solar cells via noncorrosive redox mediator

Heesuk Jung, Bonkee Koo, Jae Yup Kim, Taehee Kim, Hae Jung Son, Bongsoo Kim, Jin Young Kim, Doh Kwon Lee, Honggon Kim, Jinhan Cho, Min Jae Ko

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We demonstrate the localized surface plasmon resonance (LSPR) effect, which can enhance the photovoltaic properties of dye-sensitized solar cells (DSSCs), and the long-term stability of size-controlled plasmonic structures using a noncorrosive redox mediator. Gold nanoparticles (Au NPs) were synthesized with a phase transfer method based on ligand exchange. This synthetic method is advantageous because the uniformly sized Au NPs, can be mass produced and easily applied to DSSC photoanodes. The plasmonic DSSCs showed an 11% improvement of power conversion efficiency due to the incorporation of 0.07 wt % Au NPs, compared to the reference DSSCs without Au NPs. The improved efficiency was primarily due to the enhanced photocurrent generation by LSPR effect. With the cobalt redox mediator, the long-term stability of the plasmonic structures also significantly increased. The plasmonic DSSCs with cobalt(II/III) tris(2,2′-bipyridine) ([Co(bpy)3]2+/3+) redox mediator maintained the LSPR effect with stable photovoltaic performance for 1000 h. This is, to our knowledge, the first demonstration of the long-term stability of plasmonic nanostructures in plasmonic DSSCs based on liquid electrolytes. As a result, the enhanced long-term stability of plasmonic NPs via a noncorrosive redox mediator will increase the feasibility of plasmonic DSSCs.

Original languageEnglish
Pages (from-to)19191-19200
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number21
Publication statusPublished - 2014 Nov 12

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.


  • cobalt-based electrolyte
  • corrosion
  • dye-sensitized solar cells
  • gold nanoparticles
  • localized surface plasmon resonance
  • long-term stability

ASJC Scopus subject areas

  • Materials Science(all)


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