  In this article, we process the approximate wave function of the Dirac
particle outside the horizon of the KN ds black hole to effective potential V,
and then derive V (including real and imaginary parts). We know that fermions
cannot produce superradiation, but we can prove that Dirac particles in the KN
black hole background can have a special solution through a certain operation,
forming a Cooper pair, thus producing superradiation.We deal with the real and
imaginary parts separately. When V (real part or imaginary part) has a maximum
value, there may be a potential barrier outside the field of view to have a
chance to produce superradiation.
