Crystal growth for developing germanium detectors with internal charge amplification for low-mass dark matter searches.

ORAL

Abstract

High-purity germanium crystals with diameters up to 12 cm were grown by the Czochralski method at the University of South Dakota. The impurity level, charge drift mobility, and resistivity in the crystals were measured by the Hall Effect. The mechanical properties such as hardness and Young’s modulus were measured to calculate the speed of sound in the Ge sample and thus estimate the energy of longitudinal and transverse phonons as well as the number of phonons generated during the creation of e-h pairs. The results were used to further investigate the avalanche effect for germanium detectors with respect to electric fields under different temperatures. This work is supported by NSF OISE-1743790 and NSF PHY-1902577.

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Presenters

  • Hao Mei

    University of South Dakota

Authors

  • Hao Mei

    University of South Dakota

  • Guojian Wang

    University of South Dakota

  • Gang Yang

    University of South Dakota

  • Sanjay Bhattarai

    University of South Dakota, University of South Dakota, University of South Dakota, University Of South Dakota

  • Mathbar Singh

    University of South Dakota

  • Dongming Mei

    University of South Dakota, University of South Dakota, University of South Dakota