Question

Impurity atoms are added to which semiconductor to obtain excess free electrons?

Answer 1

Semiconductor doping is the process that changes an intrinsic semiconductor to an extrinsic semiconductor. During doping, impurity atoms are introduced to an intrinsic semiconductor. Impurity atoms are atoms of a different element than the atoms of the intrinsic semiconductor

Answer 2

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When an intrinsic semiconductor isdoped with Trivalent impurity it becomes a P-Type semiconductor. The P stands for Positive, which means the semiconductor is rich in holes or Positive charged ions. When we dope intrinsic material with Pentavalentimpurities we get N-Type semiconductor, where N stands for Negative.