Question

An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with

(1) Germanium

(2) Phosphorous

(3) Aluminium

(4) Silver

Comments

Electronic devices,semiconductors

Answer 1

Ans: (2) Phosphorous

Sol. When intrinsic semiconductor (Si or Ge) is doped with a pentavalent element, e.g. phosphorus (P), a n-type extrinsic semiconductor is created because pentavalent dopant donates one extra electron for conduction.