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Related Experiment Videos

Efficient eosin y dye-sensitized solar cell containing Br-/Br3- electrolyte.

Zhong-Sheng Wang1, Kazuhiro Sayama, Hideki Sugihara

  • 1Solar Light Energy Conversion Group, Energy Electronics Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan. zs.wang@aist.go.jp

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

The bromine/bromine triiodide (Br-/Br3-) redox couple enhances dye-sensitized solar cell performance over the iodine/iodine triiodide (I-/I3-) couple. This leads to higher open-circuit photovoltage (Voc) and overall energy conversion efficiency (eta).

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Electrochemistry

Background:

  • Dye-sensitized solar cells (DSSCs) are a promising photovoltaic technology.
  • The choice of redox electrolyte significantly impacts DSSC performance.
  • Iodine/iodide (I-/I3-) electrolytes are commonly used but have limitations.

Purpose of the Study:

  • To investigate the suitability of the bromine/bromine triiodide (Br-/Br3-) redox couple as an alternative to the I-/I3- couple in DSSCs.
  • To evaluate the impact of the Br-/Br3- electrolyte on key photovoltaic parameters, including open-circuit photovoltage (Voc), short-circuit photocurrent (Jsc), fill factor (FF), and energy conversion efficiency (eta).
  • To understand the underlying mechanisms responsible for performance differences.

Main Methods:

  • Fabrication and testing of eosin Y dye-sensitized solar cells using both Br-/Br3- and I-/I3- electrolytes in acetonitrile.

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  • Performance characterization under simulated AM1.5 one sun illumination.
  • Analysis of charge recombination kinetics.

    • Main Results:

    • The Br-/Br3- electrolyte yielded a significantly higher Voc (0.813 V) and overall efficiency (eta = 2.61%) compared to the I-/I3- electrolyte (Voc = 0.451 V, eta = 1.67%).
    • The Br-/Br3- system showed a 56% increase in eta, attributed to a substantial rise in Voc, despite slight decreases in Jsc and FF.
    • Charge recombination between bromine and injected electrons was found to be first order in bromine.

    Conclusions:

    • The Br-/Br3- redox couple is a more suitable electrolyte for eosin Y DSSCs than I-/I3-, particularly when the dye sensitizer potential is more positive than that of Br-/Br3-.
    • The improved Voc is due to an enlarged energy level difference and suppressed charge recombination.
    • The Br-/Br3- system offers a viable pathway for enhancing DSSC performance.