The potential barrier exists across the junction is 0.2volt.What minimm kinetic energy a hole should have to diffuse from the p-side to the n-side if (a)the junction is unbiased,(b)the junction is forward-biased at 0.1volt and ©the junction is reverse-biased at 0.1volt?

Explanation

Potential barrier `= 0.2Volt`
(a) `KE = (potential difference)xxe`
`= 0.2eV`
(In unbiased condition.)
(b) In forword biasing
`KE + Ve = 0.2e`
`rArr KE = 0.2e-0.1 e = 0.1 e`
(d) In revers baising
`KE+Ve = 0.2e`
`rArr KE = 0.2e+0.1e = 0.3e`