bandgap has an importance role for conduction.if bandgap is max,the conduction of electron is min. and vice-versa.hence we can say that the bandgap desides the conductivity of any material(may be...
direct band gap means in e-k diagram valance bands are exactly below covalance band,in this band electron falls from the conduction band to valance band directly without going to metastable state and...
Direct band gap means in E-K diagram valance bands are exactly below covalance band,in this band electon fall's c.b to v.b direct without going to metastable state