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Stable, high-efficiency ionic-liquid-based mesoscopic dye-sensitized solar cells.

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  • 1Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.

Small (Weinheim an Der Bergstrasse, Germany)
|November 22, 2007
PubMed
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This study presents record-efficiency, stable, solvent-free dye-sensitized solar cells (DSCs) using a novel ionic liquid electrolyte and ruthenium complex. These advancements pave the way for more efficient and durable solar energy conversion technologies.

Area of Science:

  • Materials Science
  • Renewable Energy
  • Electrochemistry

Background:

  • Dye-sensitized solar cells (DSCs) are a promising photovoltaic technology.
  • Developing efficient and stable electrolytes is crucial for DSC performance.
  • Solvent-free electrolytes offer advantages in terms of stability and environmental impact.

Purpose of the Study:

  • To develop efficient and stable mesoscopic dye-sensitized solar cells (DSCs).
  • To investigate the impact of a novel low-viscosity binary ionic liquid electrolyte on DSC performance.
  • To explore the use of a new high-molar-extinction-coefficient ruthenium complex for enhanced light harvesting.

Main Methods:

  • Fabrication of DSCs utilizing a binary ionic liquid electrolyte composed of 1-propyl-3-methyl-imidazolium iodide (PMII) and 1-ethyl-3-methyl-imidazolium tetracyanoborate (EMIB(CN)4).

Related Experiment Videos

  • Employment of a new ruthenium complex, Ru(2,2'-bipyridine-4,4'-dicarboxylic acid)(4,4'-bis(2-(4-tert-butyloxy -phenyl)ethenyl) -2,2'-bipyridine) (NCS)2, as the sensitizer.
  • Characterization of photovoltaic performance, charge transport, and electron lifetime using electrochemical impedance and photovoltage transient techniques.

    • Main Results:

    • A record photovoltaic conversion efficiency of 7.6% was achieved for solvent-free DSCs under simulated sunlight.
    • The study systematically investigated the dependence of photovoltaic performance on the PMII/EMIB(CN)4 electrolyte composition.
    • The fabricated DSCs demonstrated excellent long-term stability, retaining performance after 1000 hours of accelerated testing at elevated temperatures (80°C in dark, 60°C under visible light).

    Conclusions:

    • The combination of a low-viscosity binary ionic liquid electrolyte and a high-molar-extinction-coefficient ruthenium complex leads to highly efficient and stable solvent-free DSCs.
    • Electrolyte composition significantly influences charge transport and electron lifetime in DSCs.
    • These findings represent a significant advancement in the development of practical and durable dye-sensitized solar cell technology.