Long-term stability of ammonium-sulfide- and ammonium-fluoride-passivated CdMnTe detectors
- Authors
- Kim, K. H.; Tappero, R.; Bolotinikov, A. E.; Hossain, A.; Yang, G.; James, R. B.; Fochuk, P.
- Issue Date
- 5월-2015
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- CdMnTe; Passivation; Stability; Ammonium sulfide; Ammonium fluoride
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.66, no.10, pp.1532 - 1536
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 66
- Number
- 10
- Start Page
- 1532
- End Page
- 1536
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93677
- DOI
- 10.3938/jkps.66.1532
- ISSN
- 0374-4884
- 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 x 5 x 9 mm(3) 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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