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Key Factors Affecting the Performance of Sb2S3-sensitized Solar Cells During an Sb2S3 Deposition via SbCl3-thiourea Complex Solution-processing
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Designing Atomic Interface in Sb2S3/CdS Heterojunction for Efficient Solar Water Splitting.

Minji Yang1, Zeyu Fan1, Jinyan Du1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 8, 2024
PubMed
Summary

An ultrathin Al2O3 interlayer prevents cation diffusion in Sb2S3/CdS solar devices, suppressing defects. This modification enhances solar-to-hydrogen efficiency in photocathodes, improving stibnite-based solar energy conversion.

Keywords:
Al2O3 interlayerSb2S3/CdS heterojunctiondefect passivationinterface engineeringphotoelectrochemical water splitting

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photocatalysis

Background:

  • Antimony trisulfide (Sb2S3)-based devices are promising for solar energy conversion.
  • Cadmium sulfide (CdS) buffer layers improve charge separation but suffer from cation diffusion at the Sb2S3 interface, creating defects.
  • Stable interfaces are crucial for efficient Sb2S3 solar energy devices.

Purpose of the Study:

  • To investigate the impact of an ultrathin aluminum oxide (Al2O3) interlayer on the Sb2S3/CdS heterojunction.
  • To suppress interfacial defects caused by cation diffusion.
  • To enhance the performance of Sb2S3-based solar energy conversion devices.

Main Methods:

  • Fabrication of Ag:Sb2S3/Al2O3/CdS heterojunctions.
  • Characterization of interfacial properties and defect suppression.
  • Evaluation of water-splitting photocathode performance in neutral electrolyte.

Main Results:

  • The Al2O3 interlayer effectively prevented Cd2+ cation diffusion into the Sb2S3 layer.
  • Defect formation at the Sb2S3/CdS interface was significantly suppressed.
  • The Ag:Sb2S3/Al2O3/CdS photocathode achieved a 2.78% solar-to-hydrogen efficiency, compared to 1.66% for the control device.

Conclusions:

  • Ultrathin Al2O3 interlayers are effective in stabilizing Sb2S3/CdS heterojunctions.
  • Interface engineering is critical for optimizing Sb2S3-based solar energy devices.
  • This approach provides a pathway for developing high-performance stibnite-type semiconductor solar energy converters.