We report on the experimental demonstration of a ZnCdSe/ZnCdMgSe-based short-wavelength photovoltaic Quantum Cascade Detector (QCD). The QCD operates in two spectral bands centered around 2.6μm and 3.6μm. Calibrated blackbody measurements yield a peak responsivity of 0.1mA/W or 2400V/W at 80K, and a corresponding 300K background radiation limited infrared performance detectivity (BLIP) of ∼2.5×1010cm Hz/W. Comparison of background illuminated and dark current-voltage measurements demonstrates a BLIP temperature of 200K. The device differential resistance-area product, decreases from about 106 Ω cm2 at 80K to about 8000 Ω cm2 at 300K, indicative of the ultra-low Johnson noise in the detectors.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)