What is 2DEG (two-dimensional electron gas)?
A dense sheet of electrons confined at a heterojunction interface such as AlGaN/GaN. With little impurity scattering and high mobility, it serves as the channel of a HEMT.
Field: Compound semiconductors
2DEG (two-dimensional electron gas) in the explanations
In a GaN HEMT, the difference in spontaneous and piezoelectric polarization at the AlGaN/GaN interface creates a dense two-dimensional electron gas (2DEG) of about 10¹³ cm⁻².
Which is the channel through which current flows in a GaN H…A HEMT uses the two-dimensional electron gas at a heterojunction as its channel; because the dopants supplying electrons are separated from the layer where electrons travel (modulation doping), impurity scattering is low, enabling low-noise, high-frequency amplification.
What is a typical application of HEMTs (high electron mobil…In HEMT structures its dense two-dimensional electron gas (about 10¹³ cm⁻²) also yields high current density, giving several times the power density of GaAs.
Why is GaN well suited to high-frequency, high-power transi…
Questions that mention 2DEG (two-dimensional electron gas) (5)
- Which is the channel through which current flows in a GaN HEMT?
- What is a typical application of HEMTs (high electron mobility transistors)?
- Why is GaN well suited to high-frequency, high-power transistors?
- What is the typical crystal structure of GaN?
- In epitaxial structures for GaN HEMTs, what is the main purpose of adding carbon or iron to the GaN buffer layer beneath the channel?
Related terms
GaN (gallium nitride) HEMT (high-electron-mobility transistor) GaAs (gallium arsenide) Mobility On-resistance Wurtzite structure Alloy semiconductor Direct band gap Efficiency droop Ga2O3 (gallium oxide)