Bandgap Voltage?

Infidel22

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?

Thanks!

Gokul43201

convert bandgap energy to electron volts (if strangely, it isn't already in eV). The bandgap voltatge is numerically the same as this number.