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Generation current Seems simple enough, but I don't get something about Recombination current. They say that, if the potential across the depletion layer is [itex]\Delta \phi[/itex], the amount of holes that gets across the depletion layer (from the p-type to n-type side) through thermal motion will be proportional to [itex]e^{-\beta e \Delta \phi}[/itex], where beta is the normal thermal energy term.

Where do they get this equation?

Thanks!