Question

With which one of the following elements silicon should be doped so as to give p-type of semiconductor?

• A. Selenium
• B. Boron
• C. Germanium
• D. Arsenic

Answer 1

The correct option is B

Boron

p-type semiconductor $\to$ holes are majority carriers $e^{-}s$ are minority carriers
$\begin{array}{c}Si\to 4valenceelectrons\end{array}\}\begin{array}{cc}\stackrel{Doping}{\to }& AnygroupIIIelement\\ & (B,Al,Ga,In,Tn)\end{array}$
Boron $\to$ 3 valence electrons$✓\ast \ast$
Selenium $\to$ 6 valence electrons $\chi$
Arsenic $\to$ 5 valence electrons $\chi$
Germanium $\to$ 4 valence electrons $\chi$