Solar-Blind Diamond Detectors for Lyra, the Solar VUV Radiometer on Board Proba II

Astronomy and Astrophysics – Astronomy

Scientific paper

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Diamond, Solar-Blind Photodetector, Uv Detectors

Scientific paper

Fabrication, packaging and experimental results on the calibration of metal-semiconductor-metal (MSM) photodetectors made on diamond are reported. LYRA (Lyman-α RAdiometer onboard PROBA-2) will use diamond detectors for the first time in space for a solar physics instrument. A set of measurement campaigns was designed to obtain the XUV-to-VIS responsivity of the devices and other characterizations. The measurements of responsivity in EUV and VUV spectral ranges (40 240 nm) have been carried out by the Physkalisch-Technische Bundesanstalt (PTB) in Germany at the electron storage ring BESSY II. The longer wavelength range from 210 to 1127 nm was measured with monochromatic light by using a Xe-lamp at IMO-IMOMEC. The diamond detectors exhibit a photoresponse which lie in the 35 65 mA/W range at 200 nm (corresponding to an external quantum efficiency of 20 40%) and indicate a visible rejection ratio (200 500 nm) higher than four orders of magnitude.

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