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  4. Germanium is doped with one of the following element to obtain an n-type semiconductor. What is the element used for doping?

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Q. Germanium is doped with one of the following element to obtain an $n-type$ semiconductor. What is the element used for doping?

NTA AbhyasNTA Abhyas 2020

Solution:

Germanium belongs to group $14$ of periodic table and have $4$ valence electrons when doped with a group $15$ elements like As or $P$ form $n$ -type semiconductors due to presence of an extra valence electron.