We present a study on a set of AlGaAs/GaAs quantum well infrared photodetectors with various barrier widths from about 100 to 500 Å. At 77 K and for a large field-of-view (FOV) 300-K background operation, measured results on dark current, responsivity, and detectivity indicate that detectors with barrier widths larger than about 200 Å have similar performance. For 60-70 K and F/2 FOV, barriers need to be larger than about 300 Å to suppress inter-well tunneling.
- Design parameter
- Quantum well infrared photodetector