Compound semiconductors

What is a typical application of HEMTs (high electron mobility transistors)?

  1. AHigh-frequency, low-noise amplifiers in satellite TV receivers and mobile base stations
  2. BDRAM memory cells
  3. CGenerating power from solar heat
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Answer: A. High-frequency, low-noise amplifiers in satellite TV receivers and mobile base stations

A HEMT uses the two-dimensional electron gas at a heterojunction interface as its channel; with little impurity scattering, electron mobility is high, enabling low-noise amplification at high frequencies. GaAs HEMTs are used in satellite TV receivers and similar devices, and GaN HEMTs in base station power amplifiers.

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More Compound semiconductors questions

  1. In GaN devices, which substrates are commonly used for growing the GaN layers?
  2. Which is a characteristic of gallium oxide (Ga2O3), under research as a next-generation power semiconductor material?
  3. What is the approximate wavelength of light emitted by GaAs, which has a band gap of about 1.42 eV?
  4. Which correctly describes the typical diameter of wafers for compound semiconductors such as GaAs?
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