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Which outcome occurs when a gallium arsenide Schottky diode experiences reverse bias at cryogenic temperatures?

A)Thermionic emission decreases significantly
B)Tunneling current becomes dominant
C)Breakdown voltage increases sharply
D)Capacitance becomes temperature-stable

💡 Explanation

Increasing reverse bias lowers the depletion region barrier width. At cryogenic temperatures, thermal energy reduces, because *quantum tunneling* through this narrowed barrier becomes the main conduction mechanism, therefore tunneling current dominates, rather than thermionic emission typically seen at higher temperatures.

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