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To evaluate the applicability of multipixel Geiger photodiodes in experiments on dark matter search, such new devices from two Russian manufacturers were studied in liquid and gaseous Xe. Both n−p−π−p (“green”) and p−n−υ−n(“blue”) structures have shown photon detection efficiency (PDE) less than 1% for scintillation radiation at a wavelength of 175 nm. That is not consistent with early data for these devices [1], measured in “self-triggering” mode. Measurements in gaseous xenon have shown the presence of a visible or infrared component and the absence of this component in liquid Xe. That is consistent with early data [2]. Further studies in this field have been performed using wavelength shifting materials and “blue” photodiodes featuring the highest quantum sensitivity in the region of emission of the wavelength shifter. The tests with the use of a wavelength shifter (p-terphenyl) have shown PDE as high as (10.7±1.4) %.

Tests of Russian Multipixel Geiger Photodiodes (MRS APD and SiPM) in Liquid and Gaseous Xenon