Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.239
Publication date: 18th July 2019
High purity Germanium (HPGe) is in the front line of both fundamental research in the field of astrophysics (e.g. dark matter searches) and nuclear physics (radiation detectors). Among its many other attractive detector applications, the use of Ge in Large Enriched Germanium for Neutrinoless double beta Decay (LEGEND) experiments would need 100s of kg of detectors made of HPGe single crystals produced from enriched 76Ge isotope material. In this talk, the development of in-house constructed equipment and the process steps in the growth of 2-inch diameter single crystals will be presented. The properties that give Ge an advantage for the detector application will be discussed. The method employed to grow these bulk crystals is the Czochralski (Cz) growth technique. Crystals of high purity and a low dislocation density were grown under pure hydrogen atmosphere. These grown crystals were characterised for their suitability to detector fabrication. The challenges remaining - in achieving further “very high” purity - due to the presence of unwanted impurities with different segregation coefficients will be emphasized. Moreover, the technology for large diameter Ge crystal growth, which is currently under development, will be highlighted, including some proposals for further improvements in the crystal quality to get the detector grade material that can be used for experiments like LEGEND.
Thanks to Natasha Dropka, Jörg Fischer, Frank M. Kießling, Uta Juda and Klaus Irmscher for their help throughout the work.
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