SATHEE: Semiconductor Electronics Materials Devices and Simple Circuits

Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 18

18. Pure $S i$ at $500 K$ has equal number of electron $(n_{e})$ and hole $(n_{h})$ concentrations of $1.5 \times 10^{16} m^{- 3}$ . Doping by indium increases $n_{h}$ to $4.5 \times 10^{22} m^{- 3}$ . The doped semiconductor is of

[2011M]

(a) n-type with electron concentration

$n_{e} = 5 \times 10^{22} m^{- 3}$

(b) p-type with electron concentration

$n_{e} = 2.5 \times 10^{10} m^{- 3}$

$n_{e} = 2.5 \times 10^{23} m^{- 3}$

(d) p-type having electron concentration

$n_{e} = 5 \times 10^{9} m^{- 3}$

Show Answer

Answer:

Correct Answer: 18. (d)

Solution:

(d) $n_{i}^{2} = n_{e} n_{h}$

$\begin{aligned} (1.5 \times 10^{16})^{2} = n_{e} (4.5 \times 10^{22}) \\ \Rightarrow n_{e} = 0.5 \times 10^{10} \\ or n_{e} = 5 \times 10^{9} \\ Given n_{h} = 4.5 \times 10^{22} \\ \Rightarrow n_{h} » n_{e} \end{aligned}$

$∴$ Semiconductor is p-type and

$n_{e} = 5 \times 10^{9} m^{- 3}$ .

Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 18

18. Pure $S i$ at $500 K$ has equal number of electron $(n_{e})$ and hole $(n_{h})$ concentrations of $1.5 \times 10^{16} m^{- 3}$ . Doping by indium increases $n_{h}$ to $4.5 \times 10^{22} m^{- 3}$ . The doped semiconductor is of

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 18

18. Pure Si at 500K has equal number of electron (ne) and hole (nh) concentrations of 1.5×1016m−3. Doping by indium increases nh to 4.5×1022m−3. The doped semiconductor is of

Answer:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu

18. Pure $S i$ at $500 K$ has equal number of electron $(n_{e})$ and hole $(n_{h})$ concentrations of $1.5 \times 10^{16} m^{- 3}$ . Doping by indium increases $n_{h}$ to $4.5 \times 10^{22} m^{- 3}$ . The doped semiconductor is of