14 May 2007 An electrically-controllable multi-spectral quantum dot infrared photodetector with high photodetectivity
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Abstract
We present an electrically-controllable multi-spectral quantum dot infrared photodetector (QDIP). The QDIP consists of vertically-stacked InAs quantum dots layers with two different capping layers for MWIR and LWIR absorption, respectively. The multi-spectral QDOP is capable of simultaneously detecting multi-spectral normal incidence through inter-subband transitions in the three-dimensional (3-D) confined quantum dot nanostructures. The QDIP showed multi-color IR detection bands centered at 5.6μm, 7.7 μm and 10.0μm, respectively. By tuning the bias voltage, the detection band can be individual turned on. High photodetectivity of > 2.3×1010cmHz1/2/W were obtained for these IR detection bands. The voltage-controllable detection band selection enables real-time system reconfiguration to focus on the band of interest. The vertically-stacked device structure allows easy construction of focal plane arrays (FPA).
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Xuejun Lu, Xuejun Lu, Jarrod Vaillancourt, Jarrod Vaillancourt, Mark J. Meisner, Mark J. Meisner, } "An electrically-controllable multi-spectral quantum dot infrared photodetector with high photodetectivity", Proc. SPIE 6542, Infrared Technology and Applications XXXIII, 65420Q (14 May 2007); doi: 10.1117/12.721265; https://doi.org/10.1117/12.721265
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