InterviewSolution
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InterviewSolution
| 1. |
Explainthe workingof a semiconductor diode when it is forward biased. Draw the I-V characteristics for both forward bias and reverse bias of a semiconductordiode. |
Answer» Solution : When the +ve terminal of a BATTERY is connected to the p regionand the -ve terminal battery is connected to the n-regionof the junctiondiode ,then the p-n junctionis SAID to be forward biased. When a batteryis connected across the p-n junction diode , a p.d of .v. volt is applied across the diode . The resistance of depletionregion is very high as it has no free charge carriers.As a RESULT of this ,the potentialbarrier height is reduced and width of deplectionlayer is decreased. The +ve potential of the p-regionattracts the electrons from the n-regions and the -ve potential of the n-region ATTRACTS the holes from the p-region. Due to these , the diffusionof majority carriers takes place across the junction . Thus an electric currentwill flow due to migrationof majoritycarriersacross the p-n junction, which is called forward CURRENT. 
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