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Abstract <p>The global energy crisis is driving the search for sustainable energy resources, with solar energy emerging as a leading candidate. While dye sensitized solar cells offer potential as the third-generation solar cells, recombination losses at the photoanode/electrolyte interface limit their performance. This study introduced linoleic acid as a novel co-adsorbent to suppress recombination without slowing down charge injection from dye to TiO<sub>2</sub>. Linoleic acid also reduces the formation of dye-I<sub>2</sub> complexes by binding iodine to its double bonds. A dye sensitized solar cell with a TiO<sub>2</sub>/Dye/Linoleic acid (0.95 mM) photoanode showed an efficiency of 8.31% under 100 mW cm<sup>−2</sup> (AM 1.5) illumination, a 25% enhancement compared to the unmodified TiO<sub>2</sub>/Dye cell (6.61%). This improvement is attributed to a 38% increase in the short-circuit current density and a red shift in optical absorption due to linoleic acid adsorption. UV–Visible Diffuse Reflectance Spectroscopy revealed new energy surface states introduced by linoleic acid, enhancing electron transport. Electrochemical Impedance Spectra, Cyclic Voltammetry, and Mott–Schottky analysis confirmed reduced recombination, while enhanced incident photon to current conversion efficiency spectra validated the improved photovoltaic performance. It can be concluded that linoleic acid binds to TiO<sub>2</sub> via a bridging bidentate mode, mitigating recombination and boosting dye sensitized solar cells efficiency. These findings highlight linoleic acid’s potential to address key challenges in dye sensitized solar cells development.</p> Graphical abstract <p></p>

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Exploring linoleic acid as a novel co-adsorbent to enhance dye-sensitized solar cell efficiency through surface engineering of TiO2 at the photoanode /electrolyte interface

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • M. A. K. L. Dissanayake,
  • P. U. Sandunika,
  • G. K. R. Senadeera,
  • J. M. K. W. Kumari,
  • M. S. H. Hettiarachchi,
  • J. L. Subasinghe,
  • A. K. Karunaratne,
  • W. I. Sandamali

摘要

Abstract

The global energy crisis is driving the search for sustainable energy resources, with solar energy emerging as a leading candidate. While dye sensitized solar cells offer potential as the third-generation solar cells, recombination losses at the photoanode/electrolyte interface limit their performance. This study introduced linoleic acid as a novel co-adsorbent to suppress recombination without slowing down charge injection from dye to TiO2. Linoleic acid also reduces the formation of dye-I2 complexes by binding iodine to its double bonds. A dye sensitized solar cell with a TiO2/Dye/Linoleic acid (0.95 mM) photoanode showed an efficiency of 8.31% under 100 mW cm−2 (AM 1.5) illumination, a 25% enhancement compared to the unmodified TiO2/Dye cell (6.61%). This improvement is attributed to a 38% increase in the short-circuit current density and a red shift in optical absorption due to linoleic acid adsorption. UV–Visible Diffuse Reflectance Spectroscopy revealed new energy surface states introduced by linoleic acid, enhancing electron transport. Electrochemical Impedance Spectra, Cyclic Voltammetry, and Mott–Schottky analysis confirmed reduced recombination, while enhanced incident photon to current conversion efficiency spectra validated the improved photovoltaic performance. It can be concluded that linoleic acid binds to TiO2 via a bridging bidentate mode, mitigating recombination and boosting dye sensitized solar cells efficiency. These findings highlight linoleic acid’s potential to address key challenges in dye sensitized solar cells development.

Graphical abstract