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C is a conductor, so valence and conduction bands overlap.

if you mean SiC, silicon carbide, energy gap is ~2.86eV @ 300K (ambient temperature)

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Is silicon a direct band gap material?

Silicon is by all means an indirect band gap material.


Why is silicon not used in fabrication of LED?

Silicon is an indirect band gap semiconductor


What are the Characteristics of Direct and indirect band gap semiconductors?

Direct band semconductors are mostly for LEDs. Indirect band semiconductors like Si and Ge are conventional diodes.


Give some Examples of direct and indirect band gap semiconductors?

direct band gap-semiconductor in which the bottom of the conduction band and the top of the valence band occur at the momentum k=0;in the case of d.b.s. energy released during band-to-band electron recombination with a hole is converted primarily into radiation (radiant recombination); wavelength of emitted radiation is determined by the energy gap of semiconductor; examples of d.b.s. GaAs, InP, ZnS, ZnSs, CdS, CdSe etc. indirect bandgap semiconductor --semiconductor in which bottom of the conduction band does not occur at effective momentum k=0, i.e. is shifted with respect to the top of the valence band which occurs at k=0; energy released during electron recombination with a hole is converted primarily into phonon; e.g. Si, Ge, GaP, GaAsp ,Ge etc, .


What is forbidden gap?

When atoms are brought close together, as in a solid, the electrons come under the influence of forces from other atoms, where the energy level merges into bands of energy levels. There are two distinct energy bands in which electrons could exist: the valence band and the conduction band . Separating these two bands is an energy gap , termed the forbidden gap, in which electrons cannot normally exist.Avinash SinghJr. YSR (ISCA)Mech. Eng.KIIT UnivesityBBSR