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Stopping Potential Revisited

In a p-n junc...

Question

In a p-n junction, the depletion region is 400 nm wide and an electric field of $5 \times 10^{5} V m^{- 1}$ 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 ?

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Solution

Depletion region 'd'

$= 400 n m = 4 \times 10^{- 7} m$

(a) Potential barrier 'V'

$= E \times d = 5 \times d$

(b) Kinetic Energy required

$∴$ Potential barrier $\times e = 0.2 e V .$

[Where 'e' = Orange of electron]

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