Flat band potential definition

There is, however, a definite difference in the electrode potential between the photoexcited rc-type electrode and the p-type electrode of the same semiconductor. The electrode potential of the former is less positive than that of the latter by a magnitude nearly equal to Ae = n P p P, which is the difference between the flat band potential of the n-type and that of the p-type. The anodic dissolution of the photoexcited w-type semiconductor electrode, as a result, will occur in the potential range less positive by about Ae than that for the p-type electrode of the same semiconductor. Figure 22.10 shows schematic polarization curves of the anodic hole emitting dissolution with an n-type electrode and with a p-type electrode of the same semiconductor under the dark and photoexcitation conditions. Such photoexcited dissolution was observed with w-type GaAs electrodes [14,15],... 

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