Velocity of holes in p type semiconductor
Answers
This makes no sense to me and i think it's more of a convention. Even though we prefer talking about holes that are the majority carriers in p-type semiconductors, they have no charge and are not particles to be electrically charged. When an electron moves from a Si atom to a B atom, for example, the latter will get a stable configuration with 10 electrons. (5 of its own, 4 from covalences with 4 other Si atoms and the last one, just 'received'). The donor particle, Si, lacks now an electron and it can be considered (at least partially) positive. And what makes an electron move again is the attraction to this positive charge the Si particle has now. Why is the hole considered positively charged? And I have one more thing in mind. I have read that holes can be considered particles with a charge of +e (the electron's charge, but of opposite sign). I can understand it only this way: instead of speaking of an electron of charge -e moving from A to B, let's say, we choose to talk about a hypothetical particle of charge +e moving from B to A. All the associated notions give the same results when you try to determine them, in terms of numerical values.