Therefore, extrinsic semiconductors doped
with trivalent impurity are called p-type semiconductors For
p-type semiconductors, the recombination process will reduce
the number (ni)of intrinsically generated electrons to ne We have, for p-type semiconductors
nh >> ne
(14 4)
Note that the crystal maintains an overall charge neutrality
as the charge of additional charge carriers is just equal and
opposite to that of the ionised cores in the lattice