Physics · Pedagogy of Physics
Teaching semiconductor electronics includes explaining energy bands, doping techniques, and p-n junction behavior. During a practical session, students observe that increasing the forward-bias voltage beyond the knee voltage does not lead to an infinite, uninhibited rise in current but is limited by the bulk resistance of the semiconductor. Based on the concept of carriers and device structure, which of the following statements best explains this limitation?
- 1The energy bands collapse entirely, invalidating the basic p-n junction charge model
- 2Forward bias does not affect charge carrier movement, making current completely independent of applied voltage
- 3Students are misreading the meter; the ideal diode model always shows an infinite linear current increase without resistance
- 4At high forward bias, the current is limited by the bulk resistance of the p and n regions rather than the junction depletion barrier✓
Correct answer
At high forward bias, the current is limited by the bulk resistance of the p and n regions rather than the junction depletion barrier
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