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Long-term Stability of Ammonium-sulfide- and Ammonium-fluoride-passivated CdMnTe Detectors
김기현,R. Tappero,A. E. Bolotinikov,A. Hossain,G. Yang,R. B. James,P. Fochuk 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.10
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.
Roy, U.N.,Bolotnikov, A.E.,Camarda, G.S.,Cui, Y.,Hossain, A.,Lee, K.,Lee, W.,Tappero, R.,Yang, Ge,Cui, Y.,Burger, A.,James, R.B. Elsevier 2015 Journal of crystal growth Vol.411 No.-
<P><B>Abstract</B></P> <P>We grew CdTe<SUB> <I>x</I> </SUB>Se<SUB>1−<I>x</I> </SUB> crystals with nominal Se concentrations of 5%, 7%, and 10% by the vertical Bridgman technique, and evaluated their compositional homogeneity and structural quality at the NSLS’ X-ray fluorescence and white beam X-ray topography beam lines. Both X-ray fluorescence and photoluminescence mapping revealed very high compositional homogeneity of the CdTe<SUB> <I>x</I> </SUB>Se<SUB>1−<I>x</I> </SUB> crystals. We noted that those crystals with higher concentrations of Se were more prone to twinning than those with a lower content. The crystals were fairly free from strains and contained low concentrations of sub-grain boundaries and their networks.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdTeSe crystals were grown by the vertical Bridgman technique. </LI> <LI> Very high compositional homogeneity. </LI> <LI> Low concentration of sub-grain boundaries. </LI> <LI> Almost free from sub-grain boundary network. </LI> </UL> </P>