When we look at the PN junction diode, there is always a depletion region, for which one side in negative and one side positive. The reason behind this is that the N side depletion region is positively charged because its free electrons have recombined with the p side.
My question is that if free electrons are not attached to any particular atom, then how come they leave a hole behind when they go to the P side ? aren't holes formed when the covalent bonds can accept an electron to make covalent bond with two electrons? Since these electrons were already free, they shouldn't leave a hole behind.
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