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<p>Dye-sensitized solar cells (DSSCs) are promising third-generation photovoltaic devices, particularly suited for indoor and low-intensity light applications such as powering IoT and low-power electronics. In this study, polymer-derived carbon nanodots (CNDs) and a gel polymer electrolyte (GPE) derived using the same polymer, Poly(ethyl methacrylate) (PEMA), were used to develop DSSCs. CNDs having an average size of ~ 3.5&#xa0;nm were synthesized via a hydrothermal route using Poly(ethyl methacrylate) (PEMA) and incorporated as a dopant in the TiO<sub>2</sub> photoanode. The presence of CNDs within TiO<sub>2</sub> enabled better photon absorption and charge transfer within the device. A quasi-solid GPE based on a polymer blend containing PEMA and polyethylene glycol with an iodide/triiodide redox couple showed a high ionic conductivity (~ 8.94 mS cm<sup>−</sup>1), a wide electrochemical stability window (&gt; 1.5&#xa0;V), and a high ionic transference number (~ 98%). DSSCs fabricated with CNDs-doped TiO<sub>2</sub> and the developed GPE achieved a power conversion efficiency of 4.27% under 0.5 sun illumination, significantly outperforming the undoped device (2.14%). The enhanced charge transport, reduced recombination, and improved long-term stability over 60&#xa0;d, highlight the potential of this approach for indoor photovoltaic applications.</p>

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Polymer derived carbon nanodots and gel electrolyte for dye sensitized solar cells

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Yehya M. Megmmi

摘要

Dye-sensitized solar cells (DSSCs) are promising third-generation photovoltaic devices, particularly suited for indoor and low-intensity light applications such as powering IoT and low-power electronics. In this study, polymer-derived carbon nanodots (CNDs) and a gel polymer electrolyte (GPE) derived using the same polymer, Poly(ethyl methacrylate) (PEMA), were used to develop DSSCs. CNDs having an average size of ~ 3.5 nm were synthesized via a hydrothermal route using Poly(ethyl methacrylate) (PEMA) and incorporated as a dopant in the TiO2 photoanode. The presence of CNDs within TiO2 enabled better photon absorption and charge transfer within the device. A quasi-solid GPE based on a polymer blend containing PEMA and polyethylene glycol with an iodide/triiodide redox couple showed a high ionic conductivity (~ 8.94 mS cm−1), a wide electrochemical stability window (> 1.5 V), and a high ionic transference number (~ 98%). DSSCs fabricated with CNDs-doped TiO2 and the developed GPE achieved a power conversion efficiency of 4.27% under 0.5 sun illumination, significantly outperforming the undoped device (2.14%). The enhanced charge transport, reduced recombination, and improved long-term stability over 60 d, highlight the potential of this approach for indoor photovoltaic applications.