An equation for the collection efficiency (i.e., internal quantum efficiency) is derived that can be used for Schottky barrier, metalhyphen;insulatorhyphen; semiconductor, or semiconductorhyphen;electrolyte junction solar cells. It is obtained from an exact solution of the transport equation in the spacehyphen;charge region and includes the effects of photogenerated majority carriers. It is shown that these carriers can diffuse to the interface and thereby oppose the minorityhyphen;carrier photocurrent by recombination or emission. This effect is shown to be quite significant in reducing the collection efficiency when the majorityhyphen;carrier mobility is low and at short wavelengths where the absorption coefficient becomes large.
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