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Unformatted text preview: Does it matter where we illuminate a photodiode? As we vary x M we find that the photocurrent, i D (0,M) varies as: i D (0, M ) = -M f ( x M ) where f(x M ) as the form plotted below: M ) x M 1 f(x-w-x p 0 x n w n p Does it matter which side? No, either side of the junction is fine. Does the sign of the current change? No, the photo current is negative no matter which side of the junction is illuminated. Does it help to be near the junction? Yes, the closer to the junction and further from recombination at ohmic contacts, the better: Clif Fonstad, 10/03 Last Comments - Slide 2...
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- Fall '03