What Are Direct and Indirect Gap Materials?
In Semiconductor Physics, the Band Gap of a Semiconductor Can Be of Two Basic Types, a Direct Band Gap or an Indirect Band Gap. Examples of Direct Bandgap...
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Hereof, what is direct and indirect semiconductor?
In a direct band gap semiconductor, the top of the valence band and the bottom of the conduction band occur at the same value of momentum. In an indirect band gap semiconductor, the maximum energy of the valence band occurs at a different value of momentum to the minimum in the conduction band energy.
Additionally, what is direct transition? A direct bandgap is formed between the energy minimum of a highest band (e.g. conduction band) which occurs at the same value of the wavevector k as the energy maximum of a lower band (e.g. valence band). For an indirect bandgap, the transitions are oblique.
Furthermore, what is the difference between direct band gap and indirect bandgap semiconductor?
In direct bandgap semiconductor(DBS) the bottom of the conduction band and top of the valence band lie for the same value of k( where k=0). but in an indirect bandgap semiconductor(IBS) the bottom of the conduction band and top of the valence band lie for different values of k. where k is the electron crystal momentum.
Is Silicon direct or indirect band gap?
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.
