In an E-MOSFET, the surface is coated with ________.

The correct answer is option 4):(silicon dioxide)

Concept:

• MOSFETs or Metal Oxide Silicon Field Effect Transistors 
• The p-type semiconductor forms the base of the MOSFET.
• The two types of the base are highly doped with an n-type impurity .
• From the heavily doped regions of the base, the terminals source and drain originate.

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• The layer of the substrate is coated with a layer of silicon dioxide for insulation.
• A thin insulated metallic plate is kept on top of the silicon dioxide and it acts as a capacitor.
• The gate terminal is get out from the thin metallic plate.