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P-N junction01:11

P-N junction

760
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...
760

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Updated: Oct 20, 2025

Developing High Performance GaP/Si Heterojunction Solar Cells
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Graphene-Based Electrodes for Silicon Heterojunction Solar Cell Technology.

Ignacio Torres1, Susana Fernández1, Montserrat Fernández-Vallejo2

  • 1Departamento de Energías Renovables, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain.

Materials (Basel, Switzerland)
|September 10, 2021
PubMed
Summary
This summary is machine-generated.

Adding graphene to solar cell electrodes improves electrical properties, reducing resistance and increasing fill factor. However, more than one graphene layer decreases efficiency due to light absorption, limiting overall performance gains.

Keywords:
ITOgraphenesilicon heterojunctionsolar cellsterahertz time-domain spectroscopytransparent conductive electrodes

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Renewable Energy

Background:

  • Graphene is a promising material for transparent conductive electrodes in optoelectronic devices.
  • Graphene alone has limitations in antireflectance properties.
  • Combining graphene with transparent conductive oxides can enhance electrical performance.

Purpose of the Study:

  • To analyze the effect of combining indium tin oxide with 1-3 graphene monolayers as the top electrode in silicon heterojunction solar cells.
  • To evaluate the electrical conductance of hybrid electrodes.
  • To determine the impact on solar cell performance.

Main Methods:

  • Fabrication of silicon heterojunction solar cells with hybrid indium tin oxide/graphene electrodes.
  • Evaluation of electrical conductance using reflection-mode terahertz time-domain spectroscopy.
  • Electrical characterization of finished solar cells, including series resistance and fill factor measurements.

Main Results:

  • Electrical conductance improved with each additional graphene monolayer.
  • Series resistance decreased and fill factor increased in solar cells with hybrid electrodes.
  • Short circuit current decreased with additional graphene due to increased light absorption.

Conclusions:

  • Graphene-based hybrid electrodes show potential for improving solar cell efficiency.
  • The optimal number of graphene monolayers is crucial to balance electrical enhancement and light absorption.
  • Further research into novel designs incorporating graphene hybrid electrodes is warranted.