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Antimony Doping in Solution-processed Cu2 ZnSn(S,Se)4 Solar Cells.

Kong Fai Tai1,2, Dongchuan Fu1, Sing Yang Chiam3

  • 1Energy Research Institute@, NTU (ERI@N), Research Techno Plaza, Level 5, 50 Nanyang Drive, Singapore, 639798, Singapore.

Chemsuschem
|September 18, 2015
PubMed
Summary

Antimony (Sb) doping in kesterite copper zinc tin sulfide selenide (CZTSSe) solar cells significantly boosts power-conversion efficiency to 8.2%. Optimal doping at 0.5 mol% reduces trap density, but higher concentrations degrade performance.

Keywords:
antimony dopingkesteritesolar cellssolution processingspectroscopy

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Kesterite Cu2ZnSn(S,Se)4 (CZTSSe) is a promising material for thin-film solar cells.
  • Improving the power-conversion efficiency (PCE) of CZTSSe solar cells is crucial for their commercial viability.
  • Understanding the impact of doping on CZTSSe properties is essential for device optimization.

Purpose of the Study:

  • To investigate the effect of antimony (Sb) doping on the structural, electrical, and optoelectronic properties of CZTSSe.
  • To determine the optimal Sb doping concentration for maximizing the PCE of CZTSSe solar cells.
  • To elucidate the mechanisms by which Sb doping influences trap density and device performance.

Main Methods:

  • Facile precursor-solution method followed by selenization for CZTSSe synthesis.
  • X-ray diffraction (XRD) and Raman spectroscopy for structural characterization.
  • Power-dependent and temperature-dependent photoluminescence (PL) studies to analyze defect states.
  • Fabrication and characterization of solar cell devices to evaluate PCE, open-circuit voltage (Voc), and fill factor (FF).

Main Results:

  • A PCE of 6.0% was achieved for undoped CZTSSe, improved to 8.2% with 0.5 mol% Sb doping.
  • Sb doping increased grain size and reduced series resistance.
  • Optimal Sb doping at 0.5 mol% significantly reduced trap density, while higher concentrations led to increased defects, quenching photoexcited carriers, and reducing Voc and FF.

Conclusions:

  • Sb doping is an effective strategy to enhance the performance of CZTSSe solar cells.
  • 0.5 mol% Sb doping represents an optimal concentration for maximizing PCE by reducing trap density and improving material quality.
  • Further investigation into defect mitigation strategies is warranted for even higher-efficiency CZTSSe devices.