a) A Si MOSFET made on a p-substrate has
N_(A)=8\times 10^(14)cm^(-3)
, the source and drain are each doped to
N_(D)=6\times 10^(19)cm^(-3)
. Calculate the
V_(DS)
at which punchthrough would occur. The physical source to drain length of the MOSFET is given to be
L=4\mu m
. Assume the
V_(T)=1.0V
and the
V_(G)=0
.