Answer :

i) Each arsenic atom will provide on electron. Hence, density of electrons will be




We also know that



So density of holes in this side will be,



When boron is added to the other side then each atom will contribute to one hole. So, density of holes will be,




Now the concentration of electrons will be,




ii) Density of holes in n region is



Density of electron in p region is



So, holes in n region will contribute more to the reverse saturation current.


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