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Why is the semiconductor device called a tunnel diode?

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Why is the semiconductor device called a tunnel diode?

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With a standard germanium diode a potential barrier of 0.3 volts must be exceeded before the diode can conduct. However in a tunnel diode, according to quantum theory, a particle, in a highly doped diode or PN junction, can bypass this barrier by tunneling beneath the barrier, appearing instantaneously on the other side of the junction.

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