P-N junction
Question
The potential barrier of a P-N junction diode is 20 mV, when an electron having energy 400 meV travels from P to N, after crossing the junction the energy of the electron is
Moderate
Solution
Electric field in the depletion layer is directed from N to P. Electrons experience a force opposite to the direction of electric field. so when an electron moves from P side to N side it gains energy
so final energy = initial + gained energy in the electric field = 400+20 = 420 meV
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