Question

Electronic configuration of germanium is $2,8,18$ and $4$. To make it extrinsic semiconductor small quantity of antimony is added

• A. the material obtained will be n-type germanium in which electrons and holes are equal in number
• B. the material obtained will be p-type germanium
• C. the material obtained will be n-type germanium which has more electrons then holes at room temperature
• D. the material obtained will be n-type germanium which has less electrons than holes at room temperature

Answer 1

Answer: (C)

Antimony is pentavalent. The $Ge$ crystal with a doping of a pentavalent material will react as an n-type semiconductor in which electrons are the majority charge carries and holes are minority charge carries.