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Dependence of Performance of Surface Plasmon Coupled Quantum Well Infrared Photodetectors on Doping

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Three samples of Quantum Well Infrared Photodetectors (QWIPs) with different well doping were proposed for comparison between metallic grating and etched grating. All different doping samples with detectivity 1×1011 cm*Hz0.5/W were achieved under 77 K with metallic grating and the highest detectivity was 2.92×1011 cm*Hz0.5/W with 3.3E17 cm−3 well doping. The metallic grating samples showed a different quantum efficiency (QE) increment behavior from the etched grating samples as we increased the well doping. The QE enhancement of metallic grating sample was smaller than that in positive bias due to the potential spike between the AlGaAs/GaAs interface. The metallic grating device is more sensitive to the extra barrier between the AlGaAs/GaAs interface because of a narrower coupling bandwidth of surface plasmon. Though the enhancement varied between different samples as we changed the well dopings, the detectivity could still be kept within a reasonable range, which is important for focal plane array applications.
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Keywords: Doping; Infrared Photodetector; Quantum Well; Surface Plasmon

Document Type: Research Article

Affiliations: 1: Department of Electronic Engineering and Institute of Electronics, National Chiao Tung University, Hsinchu 30010, Taiwan 2: Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, 10617, Taiwan

Publication date: 01 November 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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