Compound semiconductors

What is an advantage of alloy semiconductors such as AlGaAs?

  1. AThey always become n-type without doping
  2. BThey always have an indirect band gap
  3. CTheir band gap and lattice constant can be adjusted by changing the composition
Show answer and explanation

Answer: C. Their band gap and lattice constant can be adjusted by changing the composition

In alloy semiconductors, the band gap and lattice constant can be tuned continuously by changing the proportions of the elements. For example, the band gap of AlGaAs increases as the aluminum fraction increases. This property is essential for tuning emission wavelengths and designing heterojunctions.

Practice this topic Back to topic

More Compound semiconductors questions

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