Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

A p - n junction possesses a depletion region that is 400 nm wide, wherein an electric field of 5 10^5 V m ⁻¹ exists. Determine the height of the potential barrier.

Options

A2.0 V
B0.2 V
C0.02 V
D1.25 V

Correct answer

B. 0.2 V

Step-by-step solution

The relation between the potential barrier height V , electric field E , and width of the depletion region d is given by V = E d . Given: E = 5 10^5 V m ⁻¹ d = 400 nm = 400 10⁻⁹ m Substituting the values: V = (5 10^5) (400 10⁻⁹) V = 2000 10⁻⁴ V V = 0.2 V

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