Question

E 4.20P) The figure shows ban diagram of a Si PN junction diode. Before solution choose suitable values of a,b and c and show this numbers clearly in a box. a) Calculate the carrier densities plot across the junction (n=1.5 1019 b)If you apply reverse bias of 1 V how the carrier densities will change across the junction Calculate and plot. ceV Ey- Evp I aev -1 beva En EF En Ev

Answer 1

Answer nummit In the above questPon the ban diagram o si pn junction dioele is shown :- Ecp tip cev Een aev EVP Ibev EF bin Evn a) The carrier densities of plot across the function is. consider as elections in the ne Potential Vbi maintains equilibrium "between the carrier both sides on junctions region. the built in distributions m to erbi Efi EF EF 1 eppn EY Efi Vbi - ICT IT en Na NH r - exp Nonld KT Р EC Glectron energy bi

b) elections The carrier densities will change across the Junction is. If we apply reverse bias for a pan Junction, then mobile and holes are swept out the space charge region. » Now, here with in the space charge charge region ng'omo =} the recombination rate becomes R of R = -cnc plenit cnn's epp' EC Ec Efi- - tpc EPC EFP Су Ev. The above calculation is the carrier densities chage DECYOSS the junction,