pic taken from hyperphysics.comSilicon has 4 valence electrons. If one atom of 5 electrons were to partner with silicon there would be one extra electron hence the name n-type . If one atom of 3 electrons were to partner with silicon there would be one extra hole hence the name p-type. Whether there is a hole or electron extra this would encourage movement of the electrons in both n or p type semiconductor. Movement of electron into the hole would create movement of hole too in the ptype .
