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The diagram of the photodiode is shown below. Why is the p+ layer very thin here? Could we have used a n+p configuration instead? enter image description here

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  • \$\begingroup\$ The light has to reach the depletion region to cause any effect. That's why the p+ layer has to be thin enough to let enough light through. \$\endgroup\$
    – Janka
    Dec 24 '17 at 6:01
  • \$\begingroup\$ @Janka: could we have used a n+p configuration in which the n+ side was thin? Is there a proper reason behind keeping the p+ side on the illumination side? \$\endgroup\$
    – Eliza
    Dec 24 '17 at 6:28

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