Question

A semiconductor diode (devices that allow current in only one direction) consists of

• A. Intrinsic semiconductor
• B. Extrinsic semiconductor
• C. both of them
• D. none of them

Answer 1

Answer: (B)

Extrinsic semiconductor

A semiconductor diode consists of p-n junction having metallic contacts at both the ends. A single piece of a semiconductor material (either Si or Ge) with one portion doped with a pentavalent impurity and other portion doped with trivalent impurity behaves as a p-n junction. Means, extrinsic semiconductor or semiconductor doped with impurities of both p and n are used in p-n junction diode.