Abstract
We evaluated the long-term stability of CdMnTe (CMT) detectors treated with ammonium-saltbased passivants. Passivation improved the detector’s stability and reduced the degradation of its energy resolution with time. Here, we stored passivated 5 × 5 × 9 mm3 CMT detectors in an ambient environment for 550 days and evaluated the effects of aging by measuring their pulse-height spectra over time. The CMT detector passivated with ammonium fluoride exhibited a higher leakage current after 550 days, and its performance was degraded accordingly. Our analyses of the leakage current for a pixelated CMT detector revealed that the edges and the corners of the detector were responsible for the higher leakage, which resulted from a degradation of the passivation layer in those areas. Assurance of the long-term stability and reproducibility of the detector necessitates that the edges and the corners be mechanically passivated following chemical treatment.
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Kim, K.H., Tappero, R., Bolotinikov, A.E. et al. Long-term stability of ammonium-sulfide- and ammonium-fluoride-passivated CdMnTe detectors. Journal of the Korean Physical Society 66, 1532–1536 (2015). https://doi.org/10.3938/jkps.66.1532
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DOI: https://doi.org/10.3938/jkps.66.1532