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Related Concept Videos

P-N junction01:11

P-N junction

784
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...
784

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Related Experiment Video

Updated: Oct 31, 2025

Developing High Performance GaP/Si Heterojunction Solar Cells
10:31

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

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Two-dimensional quantum dots for highly efficient heterojunction solar cells.

Hazem Abdelsalam1, Mohamed M Atta2, Waleed Osman3

  • 1School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, PR China; Theoretical Physics Department, National Research Centre, El-Buhouth Str., Giza, Dokki 12622, Egypt.

Journal of Colloid and Interface Science
|June 29, 2021
PubMed
Summary
This summary is machine-generated.

Functionalized 2D heterostructures like silicene/graphene offer tunable electronic properties for efficient solar cells. These materials achieve high power conversion efficiency up to 23.34% with minimal band offset.

Keywords:
DFT investigationsElectronic and optical propertiesHeterojunctionsSilicene, Graphene, ArseneneSolar cellsTwo-dimensional quantum dots

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Renewable Energy

Background:

  • Two-dimensional (2D) materials such as silicene, graphene, and arsenene offer unique electronic and optical properties.
  • Developing efficient solar cells requires precise control over material properties like energy gaps and band offsets.

Purpose of the Study:

  • Investigate the electronic and optical properties of finite silicene, graphene, and arsenene heterostructures.
  • Explore the potential of these heterostructures for constructing efficient solar cells.
  • Achieve controlled optoelectronic properties through chemical functionalization, shape, and size manipulation.

Main Methods:

  • First-principles calculations were employed to study the electronic and optical properties.
  • Chemical functionalization, shape, and size were used to tune the properties of the heterostructures.
  • Analysis of molecular orbital distribution and electronic density of states confirmed van der Waals interactions and charge separation.

Main Results:

  • Achieved heterojunctions with only van der Waals interactions in functionalized silicene/graphene and arsenene/graphene.
  • Demonstrated tunable donor energy gaps (1.2–1.8 eV) and a minimal conduction band offset (~0.002 eV).
  • Predicted a high power conversion efficiency of up to 23.34% for type-II solar cells.

Conclusions:

  • Functionalized 2D heterojunctions are promising for efficient solar cell applications.
  • These materials enable the creation of ultrathin, stable, and cost-effective solar cells.
  • The controlled electronic and optical properties are key to achieving high power conversion efficiencies.