Discussion around IR material and structure issues to go toward high performance small pixel pitch IR HOT FPAs

• Autorzy: Gravrand Olivier , Baier Nicolas , Ferron Alexandre , Rochette Florent , Lobre Clément , Bertoz Jocelyn , Rubaldo Laurent

Identyfikatory

DOI

10.24425/opelre.2023.144561

• Konferencja: Quantum Structure Infrared Photodetectors - QSIP : International Conference 2020/2022 (11 ; 2022 ; Kraków, Poland)
• Języki publikacji: EN

Abstrakty

EN

In the last decade, infrared imaging detectors trend has gone for smaller pixels and larger formats. Most of the time, this scaling is carried out at a given total sensitive area for a single focal plane array. As an example, QVGA 30 μm pitch and VGA 15 μm pitch exhibit exactly the same sensitive area. SXGA 10 μm pitch tends to be very similar, as well. This increase in format is beneficial to image resolution. However, this scaling to even smaller pixels raises questions because the pixel size becomes similar to the IR wavelength, but also to the typical transport dimensions in the absorbing material. Hence, maintaining resolution for such small pixel pitches requires a good control of the modulation transfer function and quantum efficiency of the array, while reducing the pixel size. This might not be obtained just by scaling the pixel dimensions. As an example, bulk planar structures suffer from excessive lateral diffusion length inducing pixel-to-pixel cross talk and thus degrading the modulation transfer function. Transport anisotropy in some type II superlattice structures might also be an issue for the diffusion modulation transfer function. On the other side, mesa structures might minimize cross talk by physically separating pixels, but also tend to degrade the quantum efficiency due to a non-negligible pixel fill factor shrinking down the pixel size. This paper discusses those issues, taking into account different material systems and structures, in the perspective of the expected future pixel pitch infrared focal plane arrays.

Słowa kluczowe

EN

mid-wave infrared; focal plane array; high operating temperature; small pitch; modulation transfer function; finite element method

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2023
• Tom: Vol. 31, Special Issue
• Strony: art. no. e144561
• Opis fizyczny: Bibliogr. 27 poz., rys., wykr.

Twórcy

autor

Gravrand Olivier

• CEA-LETI, 17 des Martyrs St., 38054 Grenoble, France

autor

Baier Nicolas

• CEA-LETI, 17 des Martyrs St., 38054 Grenoble, France

autor

Ferron Alexandre

• CEA-LETI, 17 des Martyrs St., 38054 Grenoble, France

autor

Rochette Florent

• CEA-LETI, 17 des Martyrs St., 38054 Grenoble, France

autor

Lobre Clément

• CEA-LETI, 17 des Martyrs St., 38054 Grenoble, France

autor

Bertoz Jocelyn

• Lynred, BP 21, 38113 Veurey-Voroize, France

autor

Rubaldo Laurent

• Lynred, BP 21, 38113 Veurey-Voroize, France

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).