In a tunnel diode, electrons can tunnel through the P-N junction mainly because

In a tunnel diode, electrons can tunnel through the P-N junction mainly because 

1.impurity level is low 2.they have high energy 3.barrier potential is very low 4.depletion layer is extremely thin 
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In a tunnel diode, electrons can tunnel through the P-N junction mainly because depletion layer is extremely thin 

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