Energy Bands in Solids

What is Fermi Level and Fermi Energy Level.

Fermi level in the case of intrinsic semiconductor lies

In a semiconductor, the forbidden energy gap between the valence band and the conduction band is of the order is;

In an insulator, the energy gap between conduction band and valence band is about;

In a metal, the separation between conduction band and valence band is of the order;

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

Value of forbidden energy gap for semiconductor is:

The energy band gap of gallium arsenide phosphate is $1.98 e\mathrm{V}$. Calculate the wavelength of electromagnetic radiation emitted (in Angstrom), when electrons and holes combine in this alloy semiconductor directly. (Take Planck's constant $\left(h\right)=6.62\times {10}^{-34 }\mathrm{J} \mathrm{s}$)

If the energy of a photon of sodium light $(\mathrm{\lambda }=589 \mathrm{n}\mathrm{m})$ is equal to the bandgap of a semiconductor, calculate the minimum energy required to create hole-electron pair. Take, $h=6.6\times {10}^{-34} \mathrm{J} \mathrm{s}, c=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$.

The forbidden energy gap between the conduction band and the valence band is not present in

The donor atom electrons have an energy level

The probability of electrons to be found in the conduction band of an intrinsic semi-conductor at a finite temperature

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

An electron hole pair is formed when light of maximum wavelength $6000 \mathrm{\AA }$ is incident on the semiconductor. The band gap energy of the semiconductor is approximately

The forbidden energy gap between valence and conduction bands of $\mathrm{Ge}$ and $\mathrm{Si}$ are respectively,

The forbidden energy gap in $Ge$ is $0.75 \mathrm{eV}$, given $hc=11250 eV \stackrel{°}{A}.$ The maximum wavelength of radiation that will generate electron hole pair is

When a solid with a band gap has a donor level just below its empty energy band, the solid is :

In a conductor, the energy gap between conduction bands and valence bands is

In a photodiode, the conductivity increases when the material is exposed to light. It is found that conductivity changes only if the wavelength is less than $600 \mathrm{n}\mathrm{m}.$ What is the bandgap?

A p-n photodiode is fabricated from a semiconductor with band gap of $2.8 \mathrm{eV}$. Can it detect a wavelength of $6000 \mathrm{nm}$?