Semiconductor Material

Is Fermi level of n type semiconductor is near conduction band?

The resistivity $\left(\rho \right)$ of semiconductor varies with temperature. Which of the following curve represents the correct behaviour?

The band gap in germanium is $∆E=0.68 eV$. Assuming that the number of hole-electron pairs is proportional to $e^{\frac{-∆E}{2kT}}$ . Find the percentage increase in the number of charge carriers in pure germanium as the temperature is increased from $300 \mathrm{K}$ to$320 \mathrm{K}.$

A photodetector is made from a semiconductor with $E_g= 0.75 \mathrm{eV}$. Calculate the maximum wavelength which it can detect.

Consider the statements
In a semi conductor
(A) There are no free electrons at $0 \mathrm{K}$.
(B) There are no free electrons at any temperature
(C) The number of free electrons increases with temperature,
(D) The number of free electrons is less than that in a conductor.

The charge carriers in an electrolyte are

In a pure semiconductor, electric current is due to_________.

In a p–type semiconductor, the concentration of holes is$2 \times {10}^{15} {\mathrm{cm}}^{-3}$  The intrinsic carrier concentration is$2 \times {10}^{10} {\mathrm{cm}}^{-3}$ . The concentration of electrons will be.

Assertion : An n-type semiconductor has a large number of electrons but still it is electrically neutral.

 Reason : An n-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity. 

How current is conducted in intrinsic semiconductor?

The probability of electrons to be found in the conduction band of an intrinsic semiconductor at finite temperature is which of the following?

If the mobility of electron in an n-type semiconductor is $3850 {\mathrm{cm}}^2{\mathrm{V}}^{-1}{\mathrm{s}}^{-1}$, then determine the density of donor atoms to be added to intrinsic germanium specimen to make it an n-type semiconductor of conductivity $5 \mathrm{mho}/\mathrm{cm}$

A piece of copper and the other germanium are cooked from room temperature at $80\mathrm{K}$, then which of the following would be a correct statement?

When the electrical conductivity of a semiconductor is due to the breaking of its covalent bonds, then the semiconductor is said to be

Which of the following is the best conductor of electricity?

The mobility of free electrons is greater than that of free holes because

Describe the conduction band and valence band in semiconductors.

The mobility of conduction electrons is greater than that of holes, since electrons

Define electron motion in a semiconductor.

The truth table of a logic gate is given as

What is the gate?