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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Silicon (Si) microwires are investigated for photocatalytic applications.
  • Efficient hydrogen (H2) evolution from water is crucial for renewable energy.
  • Photocathode performance is often limited by low photovoltage and light absorption.

Purpose of the Study:

  • To develop and evaluate B-doped p-Si microwire arrays as photocathodes for H2 evolution.
  • To investigate the effect of platinum (Pt) coating on photocathode performance.
  • To assess the energy conversion efficiency of these novel photocathodes.

Main Methods:

  • Fabrication of B-doped p-Si microwire arrays with radial n+ emitters.
  • Coating microwires with a 1.5-nm-thick discontinuous Pt film.
  • Testing photocathodes for H2 evolution under 1 sun solar simulation.
  • Measuring energy-conversion efficiencies and photovoltage.

Main Results:

  • Pt-coated B-doped p-Si microwire photocathodes achieved >5% energy-conversion efficiency.
  • These electrodes absorbed <50% of incident photons above the band gap.
  • Analogous p-Si wire arrays showed <0.2% efficiency, limited by low photovoltage.

Conclusions:

  • Discontinuous Pt films on Si microwires significantly enhance photocathode performance for H2 evolution.
  • Efficient solar-to-hydrogen conversion is achievable even with limited light absorption.
  • Optimized Si microwire design can overcome photovoltage limitations in water splitting.