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Oxygen Content Modulation Toward Highly Efficient Sb2Se3 Solar Cells.

Zixiu Cao1, Weihuang Wang1, Jiabin Dong1

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ACS Applied Materials & Interfaces
|December 8, 2022
PubMed
Summary

Controlling the vacuum environment during antimony selenide (Sb₂Se₃) film deposition prevents antimony oxide (Sb₂O₃) formation. This improves Sb₂Se₃ solar cell quality and efficiency, achieving a record 7.27% with the vapor-transport deposition method.

Keywords:
Sb2Se3 solar cellcarrier transportefficiencygrowth orientationinterface recombination

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Thin-Film Technology

Background:

  • Antimony selenide (Sb₂Se₃)-based thin-film solar cells are promising for renewable energy applications.
  • The vapor-transport deposition (VTD) method is commonly used for Sb₂Se₃ film preparation.
  • Oxygen contamination during VTD can lead to Sb₂O₃ formation, degrading device performance.

Purpose of the Study:

  • To investigate the impact of the deposition microenvironment on Sb₂O₃ formation and carrier transport in Sb₂Se₃ solar cells.
  • To optimize the VTD process for high-quality Sb₂Se₃ thin films.
  • To enhance the efficiency of Sb₂Se₃ solar cells fabricated under rough-vacuum conditions.

Main Methods:

  • Tailoring the deposition microenvironment during Sb₂Se₃ film deposition via VTD.
  • Utilizing various characterization techniques to analyze film properties and interface formation.
  • Fabricating and testing Sb₂Se₃ solar cell devices with the structure ITO/CdS/Sb₂Se₃/Spiro-OMeTAD/Au.

Main Results:

  • Controlled deposition microenvironment effectively inhibited Sb₂O₃ formation at the CdS/Sb₂Se₃ interface.
  • Enhanced crystalline quality of Sb₂Se₃ thin films was observed.
  • Modification induced (hkl, l=1)-oriented Sb₂Se₃ films, reducing interface recombination.
  • A champion solar cell efficiency of 7.27% was achieved, a record for VTD-prepared Sb₂Se₃ solar cells.

Conclusions:

  • Optimizing the deposition microenvironment is crucial for high-performance Sb₂Se₃ solar cells.
  • This approach provides a pathway for fabricating efficient Sb₂Se₃ thin-film solar cells under less stringent vacuum conditions.
  • The study offers valuable guidance for the scalable production of Sb₂Se₃ solar cells.