I also can't really understand your writing, Abdelrahman_200. But it sounds a little bit to me that you are looking to understand what takes place in the pico- and nano- seconds after a switch is applied. That is a valid question because there is a very short period of time while things re-arrange themselves. Bearing in mind that a real device has three dimensions and has outside surfaces, which are also important, as well as the PN junction itself. If all of that's your question, it has escaped your wording here. If it is something else, I'm still missing the point.
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