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Concepts Of Physics MCQ Edition [Volume 2]
Exam
Concepts Of Physics MCQ Edition [Volume 2]
Subject
Physics
Chapter
Semiconductors and Semiconductor Devices

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

A p - n junction possesses a depletion region that is 400 nm wide,...

A pp-nn junction possesses a depletion region that is 400 nm400 \text{ nm} wide, wherein an electric field of 5×105 V m−15 \times 10^5 \text{ V m}^{-1} exists. Determine the height of the potential barrier.

Options

  1. A2.0 V2.0 \text{ V}
  2. B0.2 V0.2 \text{ V}
  3. C0.02 V0.02 \text{ V}
  4. D1.25 V1.25 \text{ V}

Correct answer

B. 0.2 V0.2 \text{ V}

Step-by-step solution

The relation between the potential barrier height VV, electric field EE, and width of the depletion region dd is given by V=E×dV = E \times d.

Given:
E=5×105 V m−1E = 5 \times 10^5 \text{ V m}^{-1}
d=400 nm=400×10−9 md = 400 \text{ nm} = 400 \times 10^{-9} \text{ m}

Substituting the values:
V=(5×105)×(400×10−9)V = (5 \times 10^5) \times (400 \times 10^{-9})

V=2000×10−4 VV = 2000 \times 10^{-4} \text{ V}

V=0.2 VV = 0.2 \text{ V}
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