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Photodiode carrier transit time

  1. Jun 1, 2005 #1
    Hello, I am having a bit of trouble with the following problem:

    Assuming a built in voltage equal to the bandgap voltage, calculate the slowest possible transmit time for a carrier with 5V reverse bias applied to the GaAs photodiode.

    I would be able to do this problem without difficulty if it wasnt for the part mentioning "Bandgap Voltage." I am familiar with bangap energy and how to calculate it, but I have no idea how to figure out the bandgap voltage for a given material. Can anyone give me any hints on this?

  2. jcsd
  3. Jun 1, 2005 #2


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    hhhmmmmm Is this something more complicated than the basic relationship between electrical energy and potential? Energy gaps are typically measured in eV because electric potential is energy per charge
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