First slide

Types of semiconductors

Question

A Ge specimen is doped with Al. The concentration of acceptor atom is $10^{21} a t o m s / m^{3}$ . Given that the intrinsic concentration of electron hole pairs is $10^{19} / m^{3}$ , the concentration of electrons in the specimen is

Moderate

A

$10^{17} / m^{3}$
B

$10^{15} / m^{3}$
C

$10^{4} / m^{3}$
D

$10^{2} / m^{3}$

Solution

$F o r e x t r i n s i c s e m i c o n d u c t o r,$
$\begin{array}{l} {n_{i}}^{2} = n_{e} n_{h} \end{array}$
$\Rightarrow {(10^{19})}^{2} = n_{e} 10^{21}$
$\Rightarrow n_{e} = 10^{17} / m^{3}$

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