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A potential barrier of 0.7V exists across a p-n junctionIf the depletion layer is 7.0xx10^(-7)m thick, what is the intensity of the electric filed in this region?If an electron is approaching the p-n junction from the n-side with a speed 6.0xx10^(5)ms^(-1), determine the speed with which it enters the p-side of p-n junction. |
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Answer» SOLUTION : Here, `V_B=0.7V,d=7.0xx10^(-7)m` Intensity of electric field in the REGION of depletion layer, `E=V_B/d=(0.7)/(7.0xx10^(-7))=1.0xx10^(6)V//m` Here, `v_(1)=6.0xx10^(5)ms^(-1)`, LET `v_(2)` be the velocity with which electron ENTERS the p-region. Then `1/2xx9.1xx10^(31)xx(6.0xx10^(5))^(2)` `=(1.6xx10^(-19))xx0.7+1/2xx9.1xx10^(-31)xxv_(2)^(2)` `1.64xx10^(-19)=1.12xx10^(-19)+(9.1xx10^(-31))/2v_(2)^(2)` On solving, `v_(2)=3.4xx10^(5)ms^(-1)` |
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