The lifetime of a pn diode is not determined by the transfer of free P electrons to p holes, as electrons do not return to the n side once they fall into the p holes. Instead, the diode's longevity is influenced by external factors such as temperature, radiation damage, and mechanical stress. Under normal operating conditions, electron flow remains balanced, and the diode can function indefinitely unless its crystal structure is compromised. Overheating is a primary cause of diode failure.
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No.DIY9000 said:I was wondering, does the lifetime of a diode depend on how long it takes for all the free P electrons to transfer over to the p holes?
It depends on the current applied, they can also leave the diode. Other electrons come in from the other side, so there is never a lack/surplus of electrons. There is no "lifetime" in that sense. You can fry a diode if it gets too hot, you can kill it with radiation damage, mechanical damage and a few other things, but apart from that diodes live forever. Electron flow is always balanced.DIY9000 said:In other words, do the electrons that fall into the p holes ever return to the n side?