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The width of depletion region in p-n jun...

The width of depletion region in p-n junction diode is `500 nm` and an intrinsic electric field of `6xx 10^(5) Vm^(-1)` is also found to exist in it. What is the kinetic energy which a conduction electron must have in order to diffuse from the n-side to p-side?

A

0.3eV

B

0.30eV

C

0.45eV

D

0.60eV

Text Solution

Verified by Experts

The correct Answer is:
B
Here, `E=6xx10^(5)Vm^(-1)`
`d=500xx10^(-9)m`
Here, height of potential barrier,
`V_(B)=Ed=6xx10^(5)xx500xx10^(-9)=0.30V`
Max. K.E. of an electron to cross the potential barrier `eV_(B)=exx(0.30V)=0.30eV`
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