Question: Making the approximation that light is absorbed only in a thin surface region of thickness, , out of the total wafer thickness, , (see graphic

Making the approximation that light is absorbed only in a thin surface region of thickness, , out of the total wafer thickness, , (see graphic at right) show that the ratio of the current you measured under light (lt) to that measured in the dark (dk) is related to the photocurrent density (ph) and dark current density (dk) via: lt dk = 1 + ph dk

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