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Related Concept Videos

P-N junction01:11

P-N junction

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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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Related Experiment Video

Updated: Jan 11, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Silicon solar cells with hybrid back contacts.

Genshun Wang1,2, Mingzhe Yu1, Hua Wu1

  • 1Central R&D Institute, LONGi Green Energy Technology Co. Ltd, Xi'an, China.

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|November 12, 2025
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Summary

Researchers developed a hybrid silicon solar cell achieving 27.81% efficiency and 87.55% fill factor. This breakthrough minimizes recombination losses, advancing scalable, high-efficiency solar energy technology.

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Area of Science:

  • Materials Science
  • Renewable Energy Engineering
  • Semiconductor Physics

Background:

  • Silicon solar cells are crucial for sustainable energy but face efficiency limitations, especially concerning fill factor.
  • Fill factor losses in silicon photovoltaics are a significant barrier to achieving higher power conversion efficiencies.

Purpose of the Study:

  • To develop a hybrid interdigitated back-contact solar cell with enhanced efficiency and fill factor.
  • To investigate and mitigate carrier recombination losses in silicon solar cells.
  • To provide theoretical insights into fill factor limitations and carrier loss mechanisms.

Main Methods:

  • Development of a hybrid interdigitated back-contact solar cell architecture.
  • Integration of advanced all-surface passivation techniques.
  • Application of laser-treated tunnelling contacts.
  • Combination of high- and low-temperature processing steps.
  • Modeling of the ideality factor to analyze carrier loss mechanisms.

Main Results:

  • Achieved a power conversion efficiency of 27.81%, reaching 95% of the theoretical limit.
  • Obtained a fill factor of 87.55%, representing 98% of the theoretical limit.
  • Successfully suppressed recombination through integrated processing.
  • Enhanced contact performance via laser-treated tunnelling contacts.
  • Elucidated key fill factor losses attributed to recombination using a theoretical model.

Conclusions:

  • The developed hybrid solar cell design offers significant advancements for scalable, high-efficiency silicon photovoltaics.
  • The study provides both experimental validation and theoretical understanding of fill factor optimization.
  • This work paves the way for next-generation silicon solar cells that approach theoretical efficiency limits.