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Graphene based photoanode for DSSCs with high performances.

Bo Tang1, Haogang Yu1, Haoping Peng1

  • 1School of Petroleum Engineering, Changzhou University Changzhou 213016 People's Republic of China tangbo@cczu.edu.cn.

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|May 13, 2022
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Summary

This study enhances dye-sensitized solar cells (DSSCs) using a novel graphene-assisted photoanode. Optimized interfaces and a scattering layer significantly boost power conversion efficiency to 11.8%.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Graphene-based photoanodes show great promise for high-performance dye-sensitized solar cells (DSSCs).
  • Optimizing the interface contact between layers is crucial for efficient electron transport and overall device performance.
  • Previous studies highlight the potential of graphene materials in enhancing solar cell efficiency.

Purpose of the Study:

  • To develop and optimize a three-layer graphene-assisted photoanode for DSSCs.
  • To investigate the synergistic effects between different graphene-based layers and their impact on photovoltaic properties.
  • To enhance light scattering and dye adsorption capabilities of the photoanode.

Main Methods:

  • Fabrication of a three-layer photoanode incorporating reduced graphene oxide (RGO) and three-dimensional graphene networks (3DGNs).
  • Modification of interface contact between the transport and work layers to improve electron transport.
  • Introduction of an RGO-TiO2 scattering layer to enhance light management and dye interaction.
  • Optimization of RGO functional groups and mass fractions in the work and scattering layers.

Main Results:

  • Ameliorated interface contact significantly improved electron transport and device performance.
  • The RGO-TiO2 scattering layer enhanced light scattering and dye molecule adsorption.
  • Optimized graphene integration led to a power conversion efficiency of 11.8%.
  • The achieved efficiency surpasses previously reported values for graphene-modified DSSCs.

Conclusions:

  • The synergistic integration of RGO and 3DGNs in a multi-layer photoanode design is highly effective for DSSCs.
  • Interface engineering and the addition of a scattering layer are key strategies for maximizing photoanode performance.
  • This optimized graphene-assisted photoanode represents a significant advancement in DSSC technology, achieving record efficiencies.