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Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

  • Md Tanvir Hasan
  • Roberto Gonzalez-Rodriguez
  • Conor Ryan
  • Kristof Pota
  • Kayla Green
  • Jeffery L. Coffer
  • Anton V. NaumovEmail author
Research Article
  • 29 Downloads

Abstract

In this work, we utilize a bottom-up approach to synthesize nitrogen self-doped graphene quantum dots (NGQDs) from a single glucosamine precursor via an eco-friendly microwave-assisted hydrothermal method. Structural and optical properties of as-produced NGQDs are further modified using controlled ozone treatment. Ozone-treated NGQDs (Oz-NGQDs) are reduced in size to 5.5 nm with clear changes in the lattice structure and ID/IG Raman ratios due to the introduction/alteration of oxygen-containing functional groups detected by Fourier-transform infrared (FTIR) spectrometer and further verified by energy dispersive X-ray spectroscopy (EDX) showing increased atomic/weight percentage of oxygen atoms. Along with structural modifications, GQDs experience decrease in ultraviolet–visible (UV–vis) absorption coupled with progressive enhancement of visible (up to 16 min treatment) and near-infrared (NIR) (up to 45 min treatment) fluorescence. This allows fine-tuning optical properties of NGQDs for solar cell applications yielding controlled emission increase, while controlled emission quenching was achieved by either blue laser or thermal treatment. Optimized Oz-NGQDs were further used to form a photoactive layer of solar cells with a maximum efficiency of 2.64% providing a 6-fold enhancement over untreated NGQD devices and a 3-fold increase in fill factor/current density. This study suggests simple routes to alter and optimize optical properties of scalably produced NGQDs to boost the photovoltaic performance of solar cells.

Keywords

nitrogen-doped graphene quantum dots ozone treatment optical properties photovoltaics solar cells 

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Notes

Acknowledgements

The authors would like to thank TCU for providing funding from the TCU RCAF (Research and Creative Activities Fund), and TCU Invests in Scholarship grant funding. Also, a grant from the Robert A. Welch Foundation (Grant P-1212 to JLC) is gratefully acknowledged.

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Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Md Tanvir Hasan
    • 1
  • Roberto Gonzalez-Rodriguez
    • 1
  • Conor Ryan
    • 1
  • Kristof Pota
    • 2
  • Kayla Green
    • 2
  • Jeffery L. Coffer
    • 2
  • Anton V. Naumov
    • 1
    Email author
  1. 1.Department of Physics and AstronomyTexas Christian UniversityFort WorthUSA
  2. 2.Department of Chemistry and BiochemistryTexas Christian UniversityFort WorthUSA

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