Thank you for your reply.
In fact, I want to know which transition (interband or intersubband) is appropriate for quantum well infrared photodetectors? which of them has benefit? I have no problem with material, just transition mechanism.
Is it possible to use interband transition to design mid-infrared photodetector?
I want to design mid-infrared photodetector based on interband transition.
I could not find any article that use interband transition for mid-infrared photodetector.