HAL : in2p3-00674817, version 1

DOI : 10.1007/s10909-012-0547-1

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14th International Workshop on Low Temperature Detectors, Heidelberg : Allemagne (2011)

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

J. Domange1, 2, E. Olivieri1, N. Fourches2, A. Broniatowski1

(2012)

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.

1 :	CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)

équipe(s) de recherche : CSNSM PS1

Thème(s)

:

Physique/Physique/Instrumentations et Détecteurs Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique Physique/Matière Condensée/Autre

Mot(s)-clé(s) : Dark matter – cryogenic germanium detector – Thermally stimulated current spectroscopy

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Contributeur : Christine Hadrossek <>

Soumis le : Mardi 28 Février 2012, 11:40:26

Dernière modification le : Jeudi 22 Novembre 2012, 14:52:52