1.09 Current flow in semiconductor materials.

We know from electrical theory, that in order to conduct electricity a material must contain mobile charge carriers. The higher the density of mobile charge carriers within the material, the better the conductor it will be. When considering metal conductors the mobile charge carriers involved are free electrons. With semiconductors, we need to be able to understand conduction both in terms of free electrons and also in terms of virtual mobile charge carriers, (i.e. positively charged holes). We also need understand how the mobile charge carriers produced by doping and those due to "electron hole pair generation", contribute differently to the characteristics of semiconductor devices.
As is the case with general electrical theory, we will also have to understand the difference between electron flow and conventional current flow. (When we describe currents flowing in circuits containing semiconductor devices, conventional current flow is commonly used.)

Majority and minority mobile charge carriers.

The mobile charge carriers produced by the doping process in N type semiconductor are free electrons.
The doping process in P type semiconductor produces positively charged holes.
Electron hole pair generation also produces a much smaller number of electrons and holes in both P and N type semiconductor.
Therefore in N type semiconductor the majority (mobile) charge carriers are electrons, with a minority of holes from electron hole pair generation).
While for P type semiconductor the majority charge carriers are holes, with a minority of electrons (from electron hole pair generation).