But when electrons do move, they jump from hole to hole. In a p-semiconductor material, electrons prefer vacant valence shells since those have a lower energy than a complete shell. In a n-semiconductor material, the story is different, since all valence shells around are filled, and the excedentary electrons already have the energy required to create a new valence shell since they are already promoted to this level of energy (they are already in a 1 electron shell and don't need much energy to move to another). In a n-p junction, excedentary electrons from the n-semicondutor tend to fill the holes in the n-semiconductor, creating a i-semiconductor layer (i from intrinsic) and releasing energy in form of light (because electrons are promoted to a lower level of energy). This happens until a potential barrier is created, typically 0.6V in Si.If the electrons are not moving, then holes are not moving either.
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by Gary Elinoff