Question

How does the conductivity of an intrinsic semiconductor vary with temperature ? Explain. Show the variation in a plot.

A pure Si crystal having 5 × 10²⁸ atoms m⁻³ is doped with 1 ppm concentration of antimony. If the concentration of holes in the doped crystal is found to be 4.5 × 10⁹ m⁻³, the concentration (in m⁻³) of intrinsic charge carriers in Si crystal is about

At 0 K, the resistivity of an intrinsic semiconductor is :

Distinguish between intrinsic and extrinsic semiconductors. Although in an extrinsic semiconductor nₑ ≠ nₕ, yet it is electrically neutral. Why ?