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Pioneering an Innovative Eco-Friendly N719 Dye-Sensitized Solar Cell through Modelling and Impedance Spectroscopy
George G Njema1, Abderrahmane Elmelouky2, Edson L Meyer3
1Department of Chemistry Egerton University P.O Box 536 Egerton 20115 Kenya.
Global Challenges (Hoboken, NJ)
|September 11, 2025
Summary
This study presents a novel dye-sensitized solar cell (DSSC) achieving a 20.80% power conversion efficiency. Impedance spectroscopy reveals that efficient ion conduction and electron diffusion are key to optimizing performance and minimizing losses in these eco-friendly photovoltaic devices.
Area of Science:
- Materials Science
- Electrochemistry
- Photovoltaics
Background:
- Dye-sensitized solar cells (DSSCs) are gaining attention for their eco-friendly, affordable, and flexible nature in photovoltaic technology.
- Optimizing charge transport and minimizing recombination are crucial for enhancing DSSC performance.
Purpose of the Study:
- To present a novel DSSC configuration (FTO/WO3/N719 Dye/GO/C) with high power conversion efficiency.
- To investigate the charge transport dynamics and electrochemical performance using impedance spectroscopy.
- To correlate electrochemical parameters with device efficiency.
Main Methods:
- Fabrication of a DSSC with the configuration FTO/WO3/N719 Dye/GO/C.
- Electrochemical impedance spectroscopy (EIS) across a wide frequency range (10⁻³ to 10¹⁰ Hz).
- Analysis of complex electrical impedance (Z*) and electric modulus (M*) to study ionic transport and charge recombination.
- Development and validation of an equivalent circuit model to extract characteristic time constants.
Main Results:
- Achieved a remarkable power conversion efficiency (PCE) of 20.80%, with Voc = 1.1055 V, Jsc = 22.23 mA cm⁻², and FF = 84.65%.
- EIS analysis provided insights into ionic transport, charge recombination, ion migration, and diffusion mechanisms.
- The study identified efficient ion conduction and rapid electron diffusion as critical for charge collection and reduced recombination.
- A strong correlation was established between time constant behavior, series/shunt resistances, and overall device efficiency.
Conclusions:
- The developed DSSC demonstrates high photovoltaic performance, highlighting the potential of the FTO/WO3/N719 Dye/GO/C configuration.
- Impedance spectroscopy is a valuable tool for understanding and optimizing charge transport dynamics in DSSCs.
- Minimizing recombination losses through efficient ion conduction and electron diffusion is essential for maximizing DSSC efficiency.
