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Thermally-Stimulated Current Investigation of Dopant-Related D- and A+ Trap Centers in Germanium for Cryogenic Detector Applications

J. Domange 1 E. Olivieri 1 N. Fourches 2 A. Broniatowski 1
1 CSNSM PS1
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : Thermally-stimulated current measurements provide a sensitive tool to char-acterize carrier traps in germanium detectors for dark matter search. Using this technique at cryogenic temperatures, very shallow traps have been detected with binding energies of a fraction of a meV, associated with the dopant species in the D-(A+) charge states. A positive identification of these traps is achieved through an analysis of the field dependence of the carrier emission rates, which demonstrates a potential well for the trapped carriers in the form of a polarization well in r-4, consistent with Lax's model for carrier trapping by a neutral center. The density of these traps is assessed, and implications for the space-charge cancellation procedure in cryogenic Ge detectors are discussed.
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Submitted on : Tuesday, February 28, 2012 - 11:40:26 AM
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J. Domange, E. Olivieri, N. Fourches, A. Broniatowski. Thermally-Stimulated Current Investigation of Dopant-Related D- and A+ Trap Centers in Germanium for Cryogenic Detector Applications. 14th International Workshop on Low Temperature Detectors, Aug 2011, Heidelberg, Germany. pp.1131-1136, ⟨10.1007/s10909-012-0547-1⟩. ⟨in2p3-00674817⟩

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