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← ScienceWhich outcome occurs when a heavily-doped semiconductor photodiode is rapidly reverse-biased?
A)Avalanche breakdown generates free carriers✓
B)Thermal runaway quickly damages junction
C)Zener tunneling resistance decreases rapidly
D)Ohmic heating drastically increases resistance
💡 Explanation
Avalanche breakdown occurs because impact ionization amplifies electron-hole pairs in the high electric field rather than simple thermal effects. Therefore, free carriers are generated, rather than thermal runaway because the depletion region quickly widens preventing this.
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