COMEDK · Physics · 30. Semiconductors
The following are the graphs of potential barrier versus width of the depletion region for a p-n junction diode.
Which of the following is correct?
| I | II | III | IV |
|---|---|---|---|
| A - unbiased diode | A - Forward biased diode | A - unbiased diode | A - unbiased diode |
| B - Reverse biased | B - Reverse biased | B - Forward biased | B - unused diode |
| C - Forward biased | C - unbiased | C - Reverse biased | C - Forward biased |
- A III
- B IV
- C II
- D I
Answer & Solution
Correct Answer
(D) I
Step-by-step Solution
Detailed explanation
Forward biased diode: external voltage opposes built-in potential \(\Rightarrow\) reduced barrier height and narrower depletion region \(\Rightarrow\) Graph C (lowest, narrowest). Reverse biased diode: external voltage adds to built-in potential \(\Rightarrow\) increased barrier…
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