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Recombination current in a pn junction 
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#1
Dec113, 02:35 PM

P: 146

Hello all, I'm reading about rectification in a pn junction. My book says there are two types of current for a pn junction not in equilibrium: Generation current, and Recombination Current.
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 ptype to ntype 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! 


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