Compound semiconductors

In GaN devices, which substrates are commonly used for growing the GaN layers?

  1. AOnly quartz glass
  2. BForeign substrates such as sapphire, SiC and Si
  3. CCopper plates
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Answer: B. Foreign substrates such as sapphire, SiC and Si

Large, inexpensive GaN single-crystal substrates are hard to make, so GaN is often grown epitaxially on substrates of other materials such as sapphire, SiC and Si. Sapphire is common for LEDs, SiC for RF devices, and large, cheap Si substrates for power devices.

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More Compound semiconductors questions

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