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Researchers developed a novel magnetic fullerene-polymer interface for perovskite solar cells (PSCs). This interface enhances electron extraction and stability, achieving high power conversion efficiency (PCE) and durability for commercialization.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Nanotechnology

Background:

  • Commercializing perovskite solar cells (PSCs) requires balancing high power conversion efficiency (PCE) and long-term stability.
  • Polymer interfaces can improve PSC durability by blocking environmental factors and ion migration, but may hinder electronic performance.
  • Achieving both efficient charge extraction and robust encapsulation is crucial for stable PSCs.

Purpose of the Study:

  • To develop an advanced interface for perovskite solar cells (PSCs) that simultaneously enhances power conversion efficiency (PCE) and operational stability.
  • To overcome the electronic shielding limitations of polymer interfaces in PSCs.
  • To improve the commercial viability of PSCs through enhanced durability and performance.

Main Methods:

  • Fabrication of a novel magnetic endohedral metallofullerene (Nd@C82)-polymer coupling layer.
  • Integration of the Nd@C82-polymer layer as an interface in perovskite solar cells (PSCs).
  • Characterization of electron extraction dynamics, ion interdiffusion, power conversion efficiency (PCE), and long-term operational stability under accelerated aging conditions.

Main Results:

  • The Nd@C82-polymer coupling layer demonstrated ultrafast electron extraction and effective in situ encapsulation.
  • Perovskite solar cells (PSCs) incorporating this layer achieved a PCE of 26.78% (certified 26.29%) for small-area devices and 23.08% for 16 cm2 modules.
  • Unencapsulated devices maintained 82% of their initial PCE after 2,500 hours of continuous operation at 65°C under 1-sun illumination.

Conclusions:

  • The developed magnetic endohedral metallofullerene-polymer interface significantly enhances both the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs).
  • This approach effectively addresses the trade-off between electronic performance and durability in PSCs.
  • The findings pave the way for the commercialization of highly efficient and stable perovskite solar cells (PSCs).