For a photodetector (i.e. photodiode), which carriers (majority or minority) are

Question

For a photodetector (i.e. photodiode), which carriers (majority or minority) are more important for measuring photon-induced photocurrent? Circle the correct underlined answer, and provide a brief explanation. Using the figure of a diode junction (shown to the right), circle the correct answer of either LEFT, RIGHT, or NEITHER a) The electron minority carriers are drifting to the LEFT/RIGHT/NEITHER b) The electron majority carriers are diffusing to the LEFT/RIGHT/NEITHER d)The hole minority carriers are drifting to the LEFT/RIGHT/NEITHER d) The hole majority carriers are diffusing to the LEFT/RIGHT/NEITHER

Explanation / Answer

12- Minority carriers are more important in measuring photon induced current in photodetectors. As the reverse bias is applied to measure this current, the flow of current in reverse bias is mainly due to minority carriers. Hence thry are important.

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