(a) Deduce the expression for the width of depletion region of a pn junction.
Explanation
The width of the depletion region is a critical parameter in the design of semiconductor devices. The expression for the width of the depletion region is derived from the Poisson's equation, which is given by d^2V/dx^2 = -q \* π \* φ / π, where V is the electrostatic potential, x is the distance from the junction, q is the charge of the carrier, π is the permittivity of the semiconductor material, and φ is the electric field.
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