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Characterization of different surface passivation routes applied to a planar HPGe detector

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The European Physical Journal A, 51 (11): 141 (03.11.2015)
DOI: 10.1140/epja/i2015-15141-9

Аннотация

The effects of different passivation methods applied to the same planar high-purity germanium gamma radiation detector have been studied. By means of the scanning with a low-energy collimated gamma source, it has been found that the surface passivation gives rise to a dead layer below the intrinsic Ge surface, whose thickness and distribution are strongly dependent on the passivation type. Measured bulk detector properties like the peak-to-Compton ratio and efficiency have shown a dependence on the passivation and an influence of the passivation type on the depletion voltage, whilst the optimal energy resolution has been the same for all the passivations.

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