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

For a p - n junction having open ends,

Options

Aholes and conduction electrons systematically travel from the p -side to the n -side and from the n -side to t
Ba constant electric field exists near the junction
Cno net transfer of charge occurs between the two sides
Dcharge carriers possess no systematic motion

Correct answer

C. no net transfer of charge occurs between the two sides

Step-by-step solution

In a p - n junction with open ends (unbiased condition), the system is in a steady state of equilibrium. Due to the concentration gradient, majority carriers (holes from the p -side and electrons from the n -side) diffuse across the junction. This leaves behind uncovered, immobile positive and negative ions, creating a depletion region. These immobile ions establish a built-in electric field near the junction directed from the n -side to the p -side. In the steady state, this electric field remains constant in time

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