What is the number density of donor atoms which must be added to a pure germanium semiconductor to make n- type semiconductor of conductivity 6.4

Q: What is the number density of donor atoms which must be added to a pure germanium semiconductor to make $n-$ type semiconductor of conductivity $6.4\ {\Omega ^{ - 1}}\,c{m^{ - 1}}$? The mobility of electr ons in $n-$ type germanium is $4 \times {10^3}\ cm^2\ V^{-1}\ s^{-1}$. Neglect the contribution of holes to conductivity

d $\mathrm{J}=\sigma \mathrm{E}$ $\sigma=\frac{\mathrm{J}}{\mathrm{E}}=\frac{\mathrm{neVd}}{\mathrm{E}}=\mathrm{ne}\left(\frac{\mathrm{Vd}}{\mathrm{E}}\right)$ $\sigma=$ $\mathrm{ne}$ (mobility) $6.4 \times 100\, r^{-1} m^{-1}$ $=n\left(1.6 \times 10^{-19}\right)\left(4 \times 10^{3} \times 10^{-1}\right)$ $\Rightarrow n=10^{22} \mathrm{\,m}^{-3}$

SECTION - A [PHYSICS - MCQ]

GSEB - English Medium

What is the number density of donor atoms which must be added to a pure germanium semiconductor to make $n-$ type semiconductor of conductivity $6.4\ {\Omega ^{ - 1}}\,c{m^{ - 1}}$? The mobility of electr ons in $n-$ type germanium is $4 \times {10^3}\ cm^2\ V^{-1}\ s^{-1}$. Neglect the contribution of holes to conductivity

A$10^{16}\ m^{-3}$
B$10^{18}\ m^{-3}$
C$10^{20}\ m^{-3}$
D$10^{22}\ m^{-3}$

Medium

STD 11 Science
NEET
STD 12 - 3. current electricity
Physics

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Download App

Download our appand get started for free

Similar Questions

Download our app
and get started for free