Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 125, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.infrared.2022.104217
Keywords
Infrared; Photodetector; Superlattice; Burrier
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In this study, an innovative T2SL/InP/T2SL pBp structure was designed, fabricated and characterized. The device exhibited a cutoff wavelength of 2.3 μm at room temperature and 2.2 μm at 200K. At 200K, the device showed a low dark current density, while at room temperature it achieved a high quantum efficiency and specific detectivity. Therefore, these pBp detectors demonstrated their potential as extended short wavelength infrared detectors.
In this paper we report the design, fabrication and characterization of an innovative T2SL/InP/T2SL pBp structure based on an InGaAs/GaAsSb superlattice absorption layer lattice matched to an InP substrate. The device exhibits a cutoff wavelength of 2.3 mu m at room temperature and 2.2 mu m at 200 K. At 200 K, a dark current density of 1.3x10(-6) A/cm(2) under 0.1 V bias operation was measured. At room temperature, a quantum efficiency up to 37% and a specific detectivity of 1x10(10) cmHz(1/2)/W were achieved at 2.2 mu m. The overall performance of these pBp detectors demonstrates their potential as extended short wavelength infrared detectors.
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