What is the relationship between electron and hole mobility?

In solid-state physics, the electron mobility characterises how quickly an electron can move through a metal or semiconductor when pulled by an electric field. There is an analogous quantity for holes, called hole mobility. The term carrier mobility refers in general to both electron and hole mobility.

What is the relationship between the energy band gap and electrical conductivity?

What is the relationship between the energy band gap and Electrical conductivity? As per studies, it is noticed that as the Energy Band Gap decreases, the electrical conductivity increases.

What is the relation between wavelength and band gap?

The emission wavelengths of light emitting diodes and laser diodes are largely determined by the band gap energy. The higher that energy, the shorter the wavelengths. Note that the strongest emission occurs at photon energy is slightly above the band gap energy, particularly in situations with high carrier densities.

What band gap tells us?

A band gap is the distance between the valence band of electrons and the conduction band. Essentially, the band gap represents the minimum energy that is required to excite an electron up to a state in the conduction band where it can participate in conduction.

Why the mobility of electron is larger than mobility of holes?

Since holes are subjected to the stronger atomic force pulled by the nucleus than the electrons residing in the higher shells or farther shells, holes have a lower mobility. because electron effective mass is smaller than holes therefore mobility of electron is higher than holes.

When the band gap increases the conductivity?

All Answers (15) In intrinsic semiconductors Fermi level is ammost in the middle of the band gap and hence at a particular temperature , conductivity will decrease exponentially with band gap.

How does band gap affect conductivity?

Therefore, the band gap is a major factor determining the electrical conductivity of a solid. Substances with large band gaps are generally insulators, those with smaller band gaps are semiconductors, while conductors either have very small band gaps or none, because the valence and conduction bands overlap.

What is the relationship between band gap energy and atomic radius?

Because band gap energy decreases with the size of the unit cell, replacing larger atoms with smaller atoms will increase E. For example, if As in GaAs is replaced with P, the resulting GaP will have a larger band gap energy.

What equation shows the relationship between gap energy and wavelength?

A handy relationship between photon energy E in eV and radiation wavelength λ in nm frequently simplifies calculations in quantum problems: E(eV) = 1.24 × 103/λ(nm). Although a photon with wavelength λ has no mass, it possesses linear momentum of magnitude p = h/λ.

On what factors does the band gap depends?

The band gap energy of semiconductors tends to decrease with increasing temperature. When temperature increases, the amplitude of atomic vibrations increase, leading to larger interatomic spacing. The interaction between the lattice phonons and the free electrons and holes will also affect the band gap a little.

Why does band gap exist?

The inner electron orbitals do not overlap to a significant degree, so their bands are very narrow. Band gaps are essentially leftover ranges of energy not covered by any band, a result of the finite widths of the energy bands.