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Reducing inter-pixel crosstalk in HgCdTe detectors

Authors
  • Vallone, Marco1
  • Goano, Michele1
  • Bertazzi, Francesco1
  • Ghione, Giovanni1
  • Palmieri, Andrea1
  • Hanna, Stefan2
  • Eich, Detlef2
  • Figgemeier, Heinrich2
  • 1 Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10129, Italy , Torino (Italy)
  • 2 AIM Infrarot-Module GmbH, Theresienstraße 2, Heilbronn, 74072, Germany , Heilbronn (Germany)
Type
Published Article
Journal
Optical and Quantum Electronics
Publisher
Springer US
Publication Date
Dec 09, 2019
Volume
52
Issue
1
Identifiers
DOI: 10.1007/s11082-019-2137-9
Source
Springer Nature
Keywords
License
Yellow

Abstract

In state-of-the-art, large format, HgCdTe-based infrared focal plane arrays the typical pixel size (3–10 μm\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\upmu \mathrm{m}$$\end{document}) is of the order of the operating wavelength and much smaller than the carrier diffusion length. This makes inter-pixel crosstalk a limiting factor, especially in planar structures. Employing three-dimensional electromagnetic and electrical simulations we show that, besides reducing the dark current through Auger suppression, majority carrier depletion of the detector absorber is also effective in curtailing the inter-pixel crosstalk due to carrier diffusion. In the case of a 5μm\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$5\,\upmu \mathrm{m}$$\end{document}-pitch pixel, a proper design of the absorber composition and doping profile allows to reduce inter-pixel crosstalk by more than a factor of two when increasing the reverse bias from -0.1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$-\,0.1$$\end{document} to -0.5V\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$-\,0.5\,\mathrm{V}$$\end{document}, keeping the contribution to crosstalk coming from carrier diffusion between 2 and 12% in the mid- and long-wavelength infrared spectrum.

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