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<p>In this research, a new organic dye, referred to as 6b, is developed by integrating phenothiazine and triphenylimidazole as dual donor components, along with a furan-based <i>π</i>-linker and a cyanoacrylic acid acceptor. This D-D-<i>π</i>-A configuration is designed to enhance light absorption, charge transfer, and anchoring on TiO<sub>2</sub> surfaces for effective dye-sensitized solar cell (DSSC) applications. The produced dye demonstrates a wide visible absorption range (220–570&#xa0;nm), a high molar extinction coefficient (<i>ε</i> = 18,060&#xa0;M<sup>−1</sup>&#xa0;cm<sup>−1</sup> at 468&#xa0;nm), and well-aligned HOMO/LUMO levels that facilitate photoinduced charge separation. DSSCs constructed with three distinct electrolyte systems are evaluated. The device utilizing the MPN + BM–Gu electrolyte achieves the highest power conversion efficiency (PCE) of 7.44%, mainly due to improved dye regeneration and ionic mobility. Studies using electrochemical impedance spectroscopy (EIS) and carrier dynamics indicate favorable interfacial characteristics and effective charge transport. These findings affirm the potential of dye 6b as a promising sensitizer for high-performance DSSCs.</p>

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Phenothiazine–imidazole-based dye containing furan π-linker for dye-sensitized solar cells

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Elham N. Bifari,
  • Laila M. Nhari,
  • Reda M. El-Shishtawy,
  • Abdullah M. Asiri,
  • Kenan Ozel,
  • Abdullah Atilgan,
  • Abdullah Yildiz

摘要

In this research, a new organic dye, referred to as 6b, is developed by integrating phenothiazine and triphenylimidazole as dual donor components, along with a furan-based π-linker and a cyanoacrylic acid acceptor. This D-D-π-A configuration is designed to enhance light absorption, charge transfer, and anchoring on TiO2 surfaces for effective dye-sensitized solar cell (DSSC) applications. The produced dye demonstrates a wide visible absorption range (220–570 nm), a high molar extinction coefficient (ε = 18,060 M−1 cm−1 at 468 nm), and well-aligned HOMO/LUMO levels that facilitate photoinduced charge separation. DSSCs constructed with three distinct electrolyte systems are evaluated. The device utilizing the MPN + BM–Gu electrolyte achieves the highest power conversion efficiency (PCE) of 7.44%, mainly due to improved dye regeneration and ionic mobility. Studies using electrochemical impedance spectroscopy (EIS) and carrier dynamics indicate favorable interfacial characteristics and effective charge transport. These findings affirm the potential of dye 6b as a promising sensitizer for high-performance DSSCs.