In P-type semiconductors, a small amount of impurity/doping produces "holes": http://hyperphysics.phy-astr.gsu.edu/hbase/Solids/dope.html#c4 http://hyperphysics

In P-type semiconductors, a small amount of impurity/doping produces "holes": http://hyperphysics.phy-astr.gsu.edu/hbase/Solids/dope.html#c4 http://hyperphysics.phy-astr.gsu.edu/hbase/Solids/dope.html#... Free electrons can temporarily occupy holes, then dislodge themselves and move on to the next place. But it will look like as if the holes are moving from one place to another.