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Related Concept Videos

P-N junction01:11

P-N junction

469
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...
469

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Self-Diffusion Effect Assisted TiO2/Li3PO4 Electron Selective Passivating Contact in Silicon Solar Cells Approaching

Zhiyuan Xu1,2,3,4, Yu Yan1,2,3,4, Wei Li1,2,3,4

  • 1Institute of Photoelectronic Thin Film Devices and Technology of Nankai University, Tianjin, 300350, China.

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Summary

This study introduces a new Lithium Phosphate/Titanium Dioxide electron selective contact for crystalline silicon solar cells. This novel material significantly improves solar cell efficiency by reducing contact resistance and enhancing passivation.

Keywords:
electron selective passivating contactlithium phosphateself‐diffusion effecttitanium dioxide

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Semiconductor Devices

Background:

  • Carrier selective contacts are crucial for crystalline silicon (c-Si) solar cell performance.
  • Achieving ultra-low contact resistance and excellent passivation is essential for electron selective contact materials.

Purpose of the Study:

  • To introduce a novel Lithium Phosphate (Li3PO4) / Titanium Dioxide (TiO2) stack as an electron selective passivating contact for c-Si solar cells.
  • To investigate the contact resistivity and surface recombination effects of this new material stack.
  • To demonstrate the performance of a silicon heterojunction solar cell (SHJ) utilizing this contact.

Main Methods:

  • Fabrication of a Li3PO4/TiO2 stack on n-type c-Si substrates.
  • Incorporation of an intrinsic amorphous silicon (a-Si:H(i)) layer for passivation.
  • Characterization of contact resistivity (ρc) and surface recombination parameter (J0).
  • Fabrication and testing of a full-area rear contacted SHJ solar cell.

Main Results:

  • The Li3PO4/TiO2 stack achieved a contact resistivity (ρc) of 0.128 mΩ cm² on n-type c-Si.
  • Incorporating a 6 nm a-Si:H(i) layer reduced the surface recombination parameter (J0) to < 4 fA.
  • Phosphorus diffusion into silicon and PO43- groups were identified as key factors for low resistivity and passivation.
  • A SHJ solar cell achieved a power conversion efficiency of 22.89%.

Conclusions:

  • The Li3PO4/TiO2 stack serves as an effective electron selective passivating contact.
  • The developed contact significantly enhances c-Si solar cell performance.
  • Hydrogen-rich low-work function metal oxide stacks are promising for advanced solar cell designs.