In an unbiased P-N junction:
Correct answer: D. The diffusion and drift currents cancel each other
- A. The electric potential vanishes everywhere
- B. The electric field vanishes everywhere
- C. The diffusion current vanishes everywhere
- D. The diffusion and drift currents cancel each other
Explanation
A p-n junction is a boundary between two types of semiconductor materials, p-type and n-type. When a pn junction is unbiased, the current is zero, because the drifting of charge is the same from both sides thus there is no net movement of charge.A, B, C: In electric potential, electric field, diffusion current vanish everywhere, equilibrium will not exist, and p-n junction won't be unbiased.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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