1
GATE ECE 2025
MCQ (More than One Correct Answer)
+1
-0

Which of the following can be used as an n-type dopant for silicon?

Select the correct option(s).

A
Arsenic
B
Boron
C
Gallium
D
Phosphorous
2
GATE ECE 2025
MCQ (Single Correct Answer)
+2
-0.67
The intrinsic carrier concentration of a semiconductor is $2.5 \times 10^{16} / \mathrm{m}^3$ at 300 K . If the electron and hole mobilities are $0.15 \mathrm{~m}^2 / \mathrm{Vs}$ and $0.05 \mathrm{~m}^2 / \mathrm{Vs}$, respectively, then the intrinsic resistivity of the semiconductor (in $\mathrm{k} \Omega . \mathrm{m}$ ) at 300 K is _________ (Charge of an electron $e=1.6 \times 10^{-19} \mathrm{C}$.)
A
1.65
B
1.25
C
0.85
D
1.95
3
GATE ECE 2025
MCQ (Single Correct Answer)
+2
-0.67

The electron mobility $\mu_n$ in a non-degenerate germanium semiconductor at 300 K is $0.38 \mathrm{~m}^2 / \mathrm{Vs}$.

The electron diffusivity $D_n$ at 300 K (in $\mathrm{cm}^2 / \mathrm{s}$, rounded off to the nearest integer) is ____________

(Consider the Boltzmann constant $k_B=1.38 \times 10^{-23} \mathrm{~J} / \mathrm{K}$ and the charge of an electron $e=1.6 \times 10^{-19} \mathrm{C}$.)

A
26
B
98
C
38
D
10
4
GATE ECE 2025
Numerical
+2
-0
An ideal p-n junction germanium diode has a reverse saturation current of $10 \mu \mathrm{~A}$ at 300 K . The voltage (in Volts, rounded off to two decimal places) to be applied across the junction to get a forward bias current of 100 mA at 300 K is __________. (Consider the Boltzmann constant $k_B=1.38 \times 10^{-23} \mathrm{~J} / \mathrm{K}$ and the charge of an electron $e=1.6 \times 10^{-19} \mathrm{C}$.)
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