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\(\hbox {H}^{-}\) -Like Centers and Space-Charge Effects in Cryogenic Germanium Detectors for Dark Matter Search

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Abstract

Space-charge build-up phenomena are investigated in germanium detectors for dark matter search, associated with the thermal emission of carriers by the H\(^{-}\)-like, dopant-related A\(^{+ }\)and D\(^{-}\) shallow trap centers. Evidence for such processes follows from a combined study of the time evolution of the pattern of charge sharing between the different collection electrodes of the device, and of the kinetics of carrier emission by the A\(^{+ }\)and D\(^{- }\)centers. Implications for detector physics are discussed.

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Notes

  1. Space-charge cancellation is checked by applying a small collection voltage (a few hundredths of a volt) across the detector: as the bias polarity is inverted, the sign of the charge collection signals is equally reversed.

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Authors and Affiliations

  1. Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), IN2P3/CNRS et Université Paris XI, Bât. 108, 91405 , Orsay, France

    A. Broniatowski, M.-C. Piro, S. Marnieros, L. Dumoulin & E. Olivieri

  2. CEA-Saclay, 91191 , Gif-sur-Yvette, France

    M.-C. Piro

Authors
  1. A. Broniatowski
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  2. M.-C. Piro
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  3. S. Marnieros
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  4. L. Dumoulin
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  5. E. Olivieri
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Correspondence to A. Broniatowski.

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Broniatowski, A., Piro, MC., Marnieros, S. et al. \(\hbox {H}^{-}\) -Like Centers and Space-Charge Effects in Cryogenic Germanium Detectors for Dark Matter Search. J Low Temp Phys 176, 802–807 (2014). https://doi.org/10.1007/s10909-013-1060-x

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  • DOI: https://doi.org/10.1007/s10909-013-1060-x

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