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Related Concept Videos

P-N junction01:11

P-N junction

1.5K
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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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Related Experiment Video

Updated: Feb 28, 2026

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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Strain-balanced type-II superlattices for efficient multi-junction solar cells.

A Gonzalo1, A D Utrilla1, D F Reyes2

  • 1Institute for Systems based on Optoelectronics and Microtechnology (ISOM), Universidad Politécnica de Madrid, Avda. Complutense 30, 28040, Madrid, Spain.

Scientific Reports
|June 23, 2017
PubMed
Summary
This summary is machine-generated.

New strain-balanced superlattices using gallium arsenide antimonide (GaAsSb) and gallium arsenide nitride (GaAsN) offer a solution for high-efficiency multi-junction solar cells. These materials improve crystal quality and carrier dynamics, paving the way for near-theoretical efficiency limits.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Renewable Energy Technologies

Background:

  • Multi-junction solar cells achieve high conversion efficiencies by stacking semiconductors with different bandgaps.
  • Current record efficiencies approach 50%, but theoretical limits require specific lattice-matched materials (1.0-1.15 eV) for optimal design.
  • Existing complex alloys for these bandgaps suffer from epitaxial growth issues, degrading carrier dynamics and hindering efficiency gains.

Purpose of the Study:

  • To introduce strain-balanced gallium arsenide antimonide/gallium arsenide nitride (GaAsSb/GaAsN) superlattices as a solution to material limitations in multi-junction solar cells.
  • To demonstrate improved crystal quality, tunable bandgaps, and enhanced carrier properties using these novel superlattice structures.
  • To assess the potential of GaAsSb/GaAsN superlattices for achieving theoretical efficiency limits in next-generation solar cells.

Main Methods:

  • Fabrication of strain-balanced GaAsSb/GaAsN superlattices with controlled period thickness.
  • Characterization of crystal quality and atomic arrangement, focusing on spatial separation of Sb and N atoms.
  • Analysis of band alignment (type-II) and carrier lifetimes within the superlattice structures.
  • Measurement of external quantum efficiency under photovoltaic conditions.

Main Results:

  • Spatial separation of Sb and N atoms in GaAsSb/GaAsN superlattices mitigates common epitaxial growth problems and enhances crystal quality.
  • Tunable effective bandgap achieved by controlling superlattice period thickness.
  • Type-II band alignment observed, leading to significantly longer carrier lifetimes compared to bulk materials.
  • Demonstrated strong enhancement in external quantum efficiency under photovoltaic conditions.

Conclusions:

  • Strain-balanced GaAsSb/GaAsN superlattices represent a promising (pseudo)material for advanced multi-junction solar cells.
  • These structures overcome previous material limitations, enabling improved crystal quality and carrier dynamics.
  • Integration into gallium arsenide/germanium (GaAs/Ge)-based multi-junction solar cells could help approach theoretical efficiency limits.