What are indirect band gap semiconductors used for?

Germanium is indirect bandgap semiconductor too like silicon. And it can also used as solar cell. Si is used as a Solar cell material even though it is an indirect band gap semiconductor. An indirect bandgap semiconductor requires a photon and a phonon to go form the valence band to the conduction band.

Which of the following semiconductor has in direct bandgap?

As a result of such considerations, gallium arsenide and other direct band gap semiconductors are used to make optical devices such as LEDs and semiconductor lasers, whereas silicon, which is an indirect band gap semiconductor, is not.

Which of the following is an example of an indirect band gap?

Examples for indirect band gap semiconductor materials are silicon (Si), germanium (Ge), aluminum arsenide (AlAs) and gallium phosphide (GaP).

What is direct and indirect band gap?

The band gap is called “direct” if the crystal momentum of electrons and holes is the same in both the conduction band and the valence band; an electron can directly emit a photon. Indirect bandgap materials include crystalline silicon and Ge. Some III-V materials are indirect bandgap as well, for example AlSb.

Is a direct band gap material copper?

Cu(In1-x Gax)Se2 is one of the most promising absorber material for PV applications. It is a direct band gap semiconductor. Its energy band gap ( E g) is within the range of 1.06–1.7 eV. The exact value of E g depends on Ga/(Ga+In) ratio.

What is indirect semiconductor?

Examples of “indirect” semiconductors are Si, Ge, and GaP. In this case, the transition between the maximum of valence band to the minimum of the conductive band is not possible with only the absorption of photon with energy hν close to the bandgap Wg.

Is energy conserved in direct band gap?

In GaAs direct bandgap semiconductor, there is little change in momentum is needed for recombination process to proceed. Conservation of energy and momentum is simply met by release of photon. The emission of a photon will conserve energy but not momentum.

What are direct and indirect gap materials?

Is carbon an indirect band gap semiconductor?

Carbon nanotube: An indirect ~ 0 eV band gap material.