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Performances and Calibrations of Disruptive UVC Sensors for New Space Applications

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Abstract

This work overviews the development, selection and test of novel compact compact solid-state photodetectors based on β-Ga 2 O 3 , and optimized for the UVC. These sensors show inherently low dark currents, permitting room temperature operation without the need for a cooling system (mass and power savings) and thus avoiding cold surfaces trapping of environmental contamination. The oxide detectors have a spectral response peak at around 215-220 nm with a linewidth of 35 nm, providing excellent rejection of wavelengths above 250 nm ("250 nm solar-blindness"). Alloying β-Ga2O3 with Al can boost the natural bandgap of 4.9 eV up to 6 eV, thus offering deeper UV operation. Other key assets of β-Ga 2 O 3 detectors for space applications are their intrinsic radiation hardness (longer lifetime), and their high potential gain that allows operation at lower voltages (several hundreds mA/W at-5 V). Presently under characterization (on more than 100 protoflight models) and presenting very promising performances, these detectors, after calibration and selection, will be integrated on a nanosatellite (INSPIRE-Sat 7, a "2U" cubesat) to be launched in early 2023 to monitor the 200-242 nm UVC solar flux. Indeed, amongst other potential uses, these UVC Herzberg continuum detectors are a unique possibility to monitor the UV input from the Sun in the Earth's stratosphere. The sensors are also projected for use in a number of future solar and climate satellite constellation ventures.
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Dates and versions

insu-03878285 , version 1 (29-11-2022)

Identifiers

  • HAL Id : insu-03878285 , version 1

Cite

Imène Sidi Boumeddine, Faustine Bouyssou, Luc Damé, Halima Ghorbel, Xavier Arrateig, et al.. Performances and Calibrations of Disruptive UVC Sensors for New Space Applications. 7th International Conference on Sensors Engineering and Electronics Instrumentation Advances (SEIA' 2021), Sep 2021, Palma de Mallorca, Spain. ⟨insu-03878285⟩
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