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Q#1
PN Junction Theory
GATE EC 1991
MSQ
+2 marks
-0 marks
The current I in a forward biased 
junction shown in figure (a) is entirely due to diffusion of holes from 
and 
. The injected hole concentration distribution in the n-region is linear as shown in figure (b), with 
and 
.
Determine:
(a) The current density in the diode, assuming that the diffusion coefficient of holes is
(b) The velocity of holes in the n-region at.
(a) 
(b) 
(a)
(b) 
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