Monolithically integrated CdTe/InSb visible/midwave-infrared two-color photodetectors

Zhao Yu He, Calli M. Campbell, Maxwell B. Lassise, Zhi Yuan Lin, Jacob J. Becker, Yong-Hang Zhang

Research output: Contribution to journalArticle

Abstract

This paper reports on the demonstration of two-terminal, two-color (visible/midwave-infrared, MWIR) photodetectors (2CPDs) consisting of monolithically-integrated CdTe nBn and InSb PN sub-detectors connected by an n-CdTe/p-InSb heterovalent tunnel junction grown on lattice-matched InSb substrates. The 2CPD can be switched between MWIR (1.5–5.5 μm with a peak responsivity of 0.75 A/W at 77 K) and visible (350–780 nm with a peak responsivity of 0.3 A/W) detection bands by applying different optical and electrical biases. Band rejection ratios of 18 dB and 52 dB, and spectral cross-talks of 40 dB and 31 dB are achieved for the visible and the MWIR bands, respectively. This 2CPD can be potentially used for visible/MWIR two-color focal plane arrays with optimal fill-factors and zero spatial offset between the visible and MWIR imaging channels.

Original languageEnglish (US)
Pages (from-to)58-62
Number of pages5
JournalInfrared Physics and Technology
Volume97
DOIs
StatePublished - Mar 1 2019

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Keywords

  • CdTe
  • InSb
  • Multi-color
  • MWIR
  • Photodetector
  • Visible

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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