Which one of the following elements on doping | vedclass

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Question

(D) Germanium $(Ge)$ belongs to group $14$ of the periodic table. To create a $p$-type semiconductor, we need to dope it with an element from group $1

Vedclass · Accepted Answer

$Ga$

Vedclass · Answer

(D) Germanium $(Ge)$ belongs to group $14$ of the periodic table. To create a $p$-type semiconductor, we need to dope it with an element from group $13$, which has one less valence electron than $Ge$. This creates an electron-deficient bond or a 'hole',which acts as a positive charge carrier. Among the given options, $Bi$, $Sb$, and $As$ belong to group $15$ (which would create an $n$-type semiconductor), while $Ga$ belongs to group $13$. Therefore, doping $Ge$ with $Ga$ results in a $p$-type semiconductor.

List-$I$ (Type of solid)	List-$II$ (Example)
$(A)$ Metallic	$(1)$ Diamond
$(B)$ Ionic	$(2)$ Ice
$(C)$ Molecular	$(3)$ $NaCl$
$(D)$ Covalent	$(4)$ $Cu$

Which one of the following elements on doping with germanium, makes it a $p$-type semiconductor?

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