High operating temperature InAsSb-based mid-infrared focal plane array with a band-aligned compound barrier
Author(s): Deng, GR (Deng, Gongrong); Yang, WY (Yang, Wenyun); Zhao, P (Zhao, Peng); Zhang, YY (Zhang, Yiyun)
Source: APPLIED PHYSICS LETTERS Volume: 116 Issue: 3 Article Number: 031104 DOI: 10.1063/1.5133093 Published: JAN 21 2020
Abstract: In this work, by utilizing a band-aligned AlAs0.08Sb0.92/AlSb-based unipolar compound barrier design, a high-operability (similar to 99.7%) InAsSb bulk absorber-based mid-wavelength infrared 640 x 512 focal plane array (with a 50% cut-off wavelength at 4.1 mu m at 150 K) exhibiting distinct infrared images from 150 K up to 205 K has been achieved, which suggests great potential for high operation temperature detection applications. At 150 K and -400 mV bias, the photodetectors exhibit a low dark current density of similar to 3.9 x 10(-6) A/cm(2), a quantum efficiency of 65.1% at peak responsivity (similar to 3.8 mu m), and a specific detectivity of 1.73 x 10(12) Jones. From 150 to 185 K, the focal plane array exhibits similar to 30.2 mK and similar to 69.5 mK noise equivalent temperature difference values by using f/2.0 optics and 6.45 ms and 0.61 ms integration times, respectively.
Accession Number: WOS:000518031900011