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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Types of Semiconductors01:20

Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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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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Buffer-Less Gallium Nitride High Electron Mobility Heterostructures on Silicon.

Saptarsi Ghosh1,2, Martin Frentrup1, Alexander M Hinz1

  • 1Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.

Advanced Materials (Deerfield Beach, Fla.)
|January 23, 2025
PubMed
Summary

Researchers developed a buffer-less method for growing Gallium Nitride (GaN) on silicon, significantly reducing thermal resistance in high electron mobility transistors (HEMTs). This innovation enhances device efficiency and lifetime by improving heat dissipation.

Keywords:
AlGaN/GaN HEMTsGaN‐on‐Siheteroepitaxymagneto‐transportthermal resistance

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Nanotechnology

Background:

  • Thick metamorphic buffers are essential for III-V semiconductor epitaxy on mismatched silicon, but III-nitride buffers in GaN-on-Si HEMTs create high thermal resistance.
  • This thermal resistance hinders heat extraction, negatively impacting device efficiency and operational lifespan.

Purpose of the Study:

  • To demonstrate a novel methodology for the direct growth of Gallium Nitride (GaN) on silicon substrates, bypassing conventional buffer layers.
  • To investigate the feasibility of achieving high-quality GaN epilayers without buffers, focusing on stress management and defect reduction.
  • To evaluate the thermal and electronic properties of the resulting buffer-less GaN-on-Si structures.

Main Methods:

  • Utilized metal-organic vapor phase epitaxy (MOVPE) for direct GaN growth on an Aluminum Nitride (AlN) nucleation layer on six-inch silicon substrates.
  • Employed growth-stress modulation techniques to prevent epilayer cracking in the absence of buffer layers.
  • Characterized the material quality by measuring threading dislocation densities and analyzing the 2D electron gas (2DEG) properties via Hall-effect measurements and Shubnikov-de-Haas oscillations.

Main Results:

  • Successfully achieved direct GaN growth on silicon without metamorphic buffers, realizing comparable threading dislocation densities to buffered structures.
  • Demonstrated a significantly reduced GaN-to-substrate thermal resistance of (11 ± 4) m² K GW⁻¹, an order of magnitude lower than conventional GaN-on-Si.
  • Obtained high-quality AlGaN/AlN/GaN heterojunctions with a 2DEG exhibiting room-temperature Hall mobility exceeding 2000 cm² V⁻¹ s⁻¹ and clear Shubnikov-de-Haas oscillations.

Conclusions:

  • The buffer-less GaN-on-Si approach offers a substantial reduction in thermal resistance, paving the way for more energy-efficient power transistors.
  • This method provides a new platform for III-nitride research, enabling fundamental studies of electron dynamics in wide-bandgap quasi-2D systems.
  • The achieved material quality and electronic properties rival those of the best reported non-native substrates, highlighting the potential of this technology.