J = σ E where σ = Conductivity

While the total drift current density of a semiconductor is given by,

J = J

_{n }+ J_{p }= (n μ_{n }+p μ_{p}) q E
Thus comparing the two equations, the conductivity of a semiconductor is given by,

σ = (n μ

_{n }+ p μ_{p}) q (Ω-m)^{-1}
This is general expression of the conductivity of a semiconductor. From
this, conductivity of intrinsic and extrinsic semiconductors can be
obtained.

Thus the conductivity of a semiconductor depends on,

i) The concentration of electrons and holes i.e. n and p.

ii) The mobilities of electron and hole i.e. μ

_{n }and μ_{p}.
iii) The charge on one electron i.e. q.

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