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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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Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping
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Upcycling Discarded Photovoltaic Silicon into High-Performance Anode Material.

Caixin Zuo1, Jianbin Zheng1, Ting Yang1

  • 1Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fuzhou, Fujian, China.

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Recycling waste silicon from solar panels into porous spherical anode materials enhances lithium-ion battery performance. This sustainable approach improves energy storage by mitigating volume expansion and boosting conductivity.

Keywords:
anode materialdiscarded photovoltaic siliconelectrochemical propertyhigh silicon contentlithium‐ion battery

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Silicon is a promising anode material for lithium-ion batteries due to its high theoretical capacity.
  • Discarded photovoltaic (PV) silicon represents a waste resource that can be valorized into advanced battery materials.
  • Developing sustainable methods for silicon utilization is crucial for next-generation energy storage.

Purpose of the Study:

  • To propose a sustainable strategy for converting waste PV silicon into high-performance anode materials.
  • To engineer porous spherical silicon/carbon structures for improved battery cycling stability and ion transport.
  • To enhance the electrochemical performance of silicon anodes through carbon coating and structural design.

Main Methods:

  • Spray drying was employed to create porous spherical silicon/carbon structures.
  • An external carbon coating was applied to improve electronic conductivity and interfacial stability.
  • Electrochemical performance was evaluated through cycling tests at various current densities.

Main Results:

  • The developed spherical porous p-Si/C@C-100 anode demonstrated excellent capacity retention.
  • Specific capacities of 1075.4 mA h g⁻¹ after 300 cycles and 834.4 mA h g⁻¹ after 345 cycles were achieved at 1 and 2 A g⁻¹, respectively.
  • The porous structure and carbon coating effectively mitigated volume expansion and enhanced ion transport.

Conclusions:

  • Rational porous engineering and robust carbon encapsulation are critical for enabling fast-charging Si/C anodes.
  • Valorization of waste PV silicon offers an economical and green pathway for advanced battery materials.
  • This work highlights a sustainable approach to silicon anode development for improved lithium-ion batteries.