Effect of interdiffusion of quantum well infrared photodetector

The intersubband infrared photodetector performance is theoretically analyzed for various stages of interdiffusion in AlGaAs/GaAs quantum well. The absorption strength and responsivity are enhanced for certain extents of interdiffusion and the peak detection wavelength red shifts continuously with a large tunable range from 7 to 38.4 µm. The dark current is at an acceptable value for small diffusion extent. ©1996 American Institute of Physics.published_or_final_versio