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<p>In this study, natural dyes extracted from <i>Cotinus coggygria</i> (CC), <i>Prunus padus</i> (PP), and <i>Prunus cerasifera</i> (PC) were evaluated as sensitizers for TiO<sub>2</sub>-based dye-sensitized solar cells (DSSCs). A systematic set of photophysical, electrochemical, photovoltaic, and impedance measurements was performed under identical fabrication and testing conditions to clarify the structure-performance relationships of the three extracts. Among the investigated sensitizers, the PC-based device delivered the best performance, with a short-circuit current density of 2.87&#xa0;mA cm<sup>−2</sup>, an open-circuit voltage of 0.52&#xa0;V, and a power conversion efficiency of 0.99%. Electrochemical impedance spectroscopy further showed that the PC-sensitized cell exhibited lower charge-transfer resistance and more favorable charge-transport behavior. The observed correlation between electron-injection driving force and photocurrent density indicates that interfacial electron injection is the dominant parameter governing device performance. This study therefore provides a controlled comparison of Anacardiaceae and Rosaceae-derived sensitizers prepared using the same fabrication route and demonstrates that anthocyanin-rich Rosaceae extracts offer more consistent and efficient sensitization. The results provide practical guidance for the selection and optimization of plant-based sensitizers in sustainable DSSC technologies.</p>

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Interfacial electron injection and structure-performance relationships of plant-derived sensitizers in TiO2-based dye-sensitized solar cells

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • M. Erdoğdu,
  • K. Ozel,
  • A. Atilgan,
  • A. Yildiz,
  • Y. Erdogdu

摘要

In this study, natural dyes extracted from Cotinus coggygria (CC), Prunus padus (PP), and Prunus cerasifera (PC) were evaluated as sensitizers for TiO2-based dye-sensitized solar cells (DSSCs). A systematic set of photophysical, electrochemical, photovoltaic, and impedance measurements was performed under identical fabrication and testing conditions to clarify the structure-performance relationships of the three extracts. Among the investigated sensitizers, the PC-based device delivered the best performance, with a short-circuit current density of 2.87 mA cm−2, an open-circuit voltage of 0.52 V, and a power conversion efficiency of 0.99%. Electrochemical impedance spectroscopy further showed that the PC-sensitized cell exhibited lower charge-transfer resistance and more favorable charge-transport behavior. The observed correlation between electron-injection driving force and photocurrent density indicates that interfacial electron injection is the dominant parameter governing device performance. This study therefore provides a controlled comparison of Anacardiaceae and Rosaceae-derived sensitizers prepared using the same fabrication route and demonstrates that anthocyanin-rich Rosaceae extracts offer more consistent and efficient sensitization. The results provide practical guidance for the selection and optimization of plant-based sensitizers in sustainable DSSC technologies.