Compound semiconductors

Which impurity is typically used to make p-type layers in GaN?

  1. APhosphorus (P)
  2. BArsenic (As)
  3. CMagnesium (Mg)
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Answer: C. Magnesium (Mg)

Magnesium is used to make GaN p-type. As grown, it is bonded with hydrogen and inactive, so it must be activated by heat treatment or similar means; establishing this technique led to the realization of high-brightness blue LEDs.

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  1. What is the typical crystal structure of GaN?
  2. Which is an example of an application of HBTs (heterojunction bipolar transistors) made from InP or GaAs?
  3. When silicon is added to GaAs to make it n-type, which site does the silicon mainly occupy?
  4. What is the advantage of using semi-insulating GaAs substrates for GaAs RF ICs?
  5. Which is a characteristic of micro-LED displays?