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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Surface Molecular Engineering for Fully Textured Perovskite/Silicon Tandem Solar Cells.

Jun Chen1, Shaofei Yang2, Long Jiang3

  • 1Institute of Photovoltaics, School of Physics and Materials Science, Nanchang University, Nanchang, 330031, China.

Angewandte Chemie (International Ed. in English)
|June 11, 2024
PubMed
Summary

Researchers developed a new surface passivation strategy for perovskite/silicon tandem solar cells using dynamic spray coating. This method enhances efficiency and stability in industrial silicon wafer-based devices.

Keywords:
bifunctional moleculedipole layerperovskite/silicon tandem devicessurface passivation

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Industrial silicon wafers require double-side textured architecture for perovskite/silicon tandem devices.
  • Existing surface engineering methods for perovskites are not suitable for micrometric textures.

Purpose of the Study:

  • To develop a surface passivation strategy for textured industrial silicon wafers in perovskite/silicon tandem devices.
  • To improve the efficiency and stability of these tandem solar cells.

Main Methods:

  • Dynamic spray coating (DSC) of fluorinated thiophenethylammonium ligands.
  • Molecular engineering with a trifluoromethyl group for enhanced passivation.
  • Theoretical calculations and experimental validation.

Main Results:

  • Conformal coverage and suppressed phase conversion on textured surfaces.
  • Effective surface passivation via strong interaction, energy alignment, and dipole layer formation.
  • Achieved a certified stabilized power conversion efficiency of 30.89% for tandem cells.
  • Demonstrated excellent operational stability, retaining over 97% performance after 600 hours.

Conclusions:

  • The developed DSC strategy with bifunctional molecules is effective for large-scale perovskite/silicon tandem devices.
  • This approach overcomes limitations of applying surface engineering to micrometric textures.
  • The high efficiency and stability pave the way for commercialization of advanced solar cell technology.