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Breakthrough in Silicon Solar Cells: Oxygen-Doping Strategy Showcases Efficiency Gains

Strategic Insights

— 2 min read

Researchers from the Beijing University of Technology have made a significant breakthrough in the field of silicon solar cells, introducing an oxygen-doping strategy to enhance their efficiency and stability. According to a recent study published in the journal Advanced Functional Materials, this innovative approach has shown remarkable results, retaining up to 70% of initial light soaking efficiency gains over 30 days. The research team, led by Zilong Zheng, has developed a low-power UV light soaking protocol that delivers absolute efficiency gains of 0.34% and 0.41% in silicon heterojunction (SHJ) and hybrid back contact (BC) solar cells, respectively. This achievement has far-reaching implications for the development of high-performance silicon photovoltaics.

Key Takeaways:

  • The oxygen-doping strategy has shown significant improvement in the stability of silicon solar cells, retaining 57% and 70% of initial light soaking efficiency gains over 30 days in SHJ and hybrid BC solar cells, respectively.
  • The low-power UV light soaking protocol developed by the research team has achieved absolute efficiency gains of 0.34% and 0.41% in SHJ and hybrid BC solar cells, respectively, meeting the conventional high-intensity white light soaking performance at 30 kW m-2 while requiring only 4% of energy input at 1.2 kW m-2.
  • Molecular dynamics simulations have confirmed the stabilization mechanism of the oxygen-doping strategy, showing reduced hydrogen diffusion.
  • The research has provided a scalable pathway for industrial high-performance silicon photovoltaics.
  • The study has been peer-reviewed and published in Advanced Functional Materials, a reputable scientific journal.

Statistics:

  • 95% of the photovoltaic market is dominated by crystalline silicon solar cells, which have achieved record efficiencies beyond 27% through innovations such as silicon heterojunction (SHJ) and heterojunction back contact (BC).
  • 57% and 70% of initial light soaking efficiency gains were retained over 30 days in SHJ and hybrid BC solar cells, respectively, using the oxygen-doping strategy.
  • The low-power UV light soaking protocol required only 4% of energy input at 1.2 kW m-2 to achieve efficiency gains of 0.34% and 0.41% in SHJ and hybrid BC solar cells, respectively.

Sources:

  • VerticalNews:

"Crystalline silicon solar cells dominate over 95% of the photovoltaic market and have achieved record efficiencies beyond 27% through innovations such as silicon heterojunction (SHJ) and heterojunction back contact (BC). Although light soaking enhances efficiency by driving hydrogen migration to passivate interfacial defects, the instability of newly formed Si & horbar;H bonds leads to performance degradation."

  • Advanced Functional Materials: "Interface Engineering With Oxygen-doped Amorphous Silicon for Stabilizing Light Soaking Gains In Silicon Solar Cells."
  • Beijing University of Technology: "This issue is addressed by introducing an oxygen-doping strategy at the hydrogenated amorphous/crystalline silicon (a-Si:H/c-Si) interface. Incorporating an ultrathin oxygen-doped layer leverages oxygen electronegativity to suppress hydrogen migration."

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