Answer: Most carriers reach the junction (low recombination loss).
- A Most carriers recombine before reaching junction according to conventional understanding
- B Most carriers reach the junction (low recombination loss)
- C Diffusion is negligible in routine practice overall
- D Drift dominates usually in most cases under typical conditions
Correct answer: B. Most carriers reach the junction (low recombination loss)
Explanation: If device length much shorter than diffusion length, minority carriers traverse the base/region with minimal recombination. High efficiency (solar cells, BJT base).
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.