Suppose I have an extrinsic semiconductor made of silicon and doped with phosphorous. Now, phosphorous has one more electron than silicon. After replacing one silicon atom, and taking its place, the phosphorous safely form covalent bonds with four surrounding silicon atoms, with one extra electron. At a certain temperature, this extra electron gains enough energy to jump into the conduction band and move around the semiconductor. However, the moment this electron leaves the current position, the phosphorous atom becomes positively charged. We call this an n-type semiconductor and electrons are the majority charge carriers.
However, when the electron moves away from the starting position, why don't we say that a hole has been created, instead of saying that we have a cation now?
Similarly, if the silicon is doped with boron, the boron forms bonds with three silicon atoms, and one 'incomplete' bond due to a lack of a single electron. Some nearby silicon jumps in to fill this spot, and that position becomes empty. The boron becomes negatively charged. However, the surrounding silicon has just lost an electron. In the previous case, when the phosphorous lost an electron, we said that it has become a cation. In this case, however, we say that an electron-hole has been created, instead of saying that the silicon has become a cation.
So, when do we say a hole has been created vs an atom has become positively charged. My intuition says, that when an electron is removed from a covalent bond, we say hole has been created. However, when an electron is removed, that wasn't part of a bond, we just say that the atom has become positively charged. Can someone verify this for me ?
In this p-type semiconductor, why do we call the holes to be the majority carriers ? Since the electrons jump from one position to another, thus making it look like the holes are jumping, we could have easily said that electrons are the majority charge carriers.
In the n-type, this is somewhat obvious as the electrons are mobile, while the hole(of the cation) stays in place, as the surrounding electrons do not rush in to occupy the position. But in case of the p-type, both the electrons and the holes move. SO, why do we call holes the majority charge carriers, even though it is actually the electrons that are moving ?