Question:
In a p-n junction, the depletion region is $400 \mathrm{~nm}$ wide and an electric field of $5 \times 10^{5} \mathrm{~V} / \mathrm{m}$ exists in it.
(a) Find the height of the potential barrier.
(b) What should be the minimum kinetic energy of a conduction electron which can diffuse from the n-side to the p-side?
Solution:
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