4.3. Construction of MOSFET

Try these first

1. 1.

   What type of substrate is used for n-channel MOSFETs?

   Hint

   Think about the type of carriers in n-channel.

2. 2.

   What is the role of the SiO₂ layer?

   Hint

   Remember its importance for preventing gate current.

3. 3.

   What type of substrate is used for an n-channel MOSFET?

   • n-type
   • p-type
   • Insulator

   Hint

   Focus on the type of charge carrier it uses.

4. 4.

   True or False: The gate of a MOSFET allows current to flow through it.

   • True
   • False

   Hint

   Think about the significance of the SiO₂ layer.

5. 5.

   How would the performance of an n-channel MOSFET be affected if the substrate used was heavily doped p-type instead of a lightly doped one?

   Hint

   Consider how doping concentrations affect conductivity and carrier mobility.

6. 6.

   Describe a scenario where the insulation layer might fail and discuss its potential consequences on MOSFET operation.

   Hint

   Think about the role of insulation in preventing current leaks.