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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5885-5889 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silicon nitride films grown by plasma-enhanced chemical vapor deposition (PECVD) are used for a variety of applications in integrated circuit and solar cell industries, such as surface passivation and insulation. The objective of this article is to investigate and understand the impact of the PECVD deposition parameters on the silicon surface passivation and establish the correlation between the properties of the silicon nitride and the ensuing silicon surface recombination velocity. All the films were annealed at 350 °C for 20 min in a rapid thermal annealer after the deposition. It is shown that bonded hydrogen and positive charge in the annealed PECVD silicon nitride films have the opposite effect on the surface passivation. The surface recombination velocity decreases with the increase in the positive charge density and the decrease in the bonded hydrogen content. It is found that the deposition temperature has the most influence on achieving low surface recombination velocity. Higher deposition temperature in the range of 200–300 °C produces lower surface recombination velocity. Optimal silicon nitride deposition conditions resulted in a surface recombination velocity of 119 cm/s on 2 Ω cm p-type silicon. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
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    Unknown
    Woodstock, Md., etc : Periodicals Archive Online (PAO)
    Theological Studies. 56:3 (1995:Sept.) 605 
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Transplant international 11 (1998), S. S119 
    ISSN: 1432-2277
    Keywords: Key words Epstein-Barr virus ; Kidney transplantation ; Infection ; Rejection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Besides the well-known association of Epstein-Barr virus (EBV) and lymphomas developing posttransplantation, there are only a few data concerning the prevalence of EBV antibodies (abs) in organ donors and recipients, the posttransplant development of antibody titer in the recipient population, the extent of EBV-IgM seroconversion, and the clinical and laboratory signs associated with infection. Therefore, in a retrospective analysis, we evaluated the data of 119 organ donors and 215 kidney graft recipients who received their kidney allografts between 1993 and 1995. A total of 665 sera were quantitatively tested by means of immunofluorescence assay for EBV abs against capsid (CA; IgM, IgG), early (IgG), and nuclear (IgG) antigens. Recipient sera were obtained for testing before kidney transplantation (KTx) and at post-KTx days 32, 67, and 649 (mean values). Pre-KTx all organ donors and 98.65 % of the recipients were EBV-CA-IgG positive, only in two cases was there a D+/R− (donor/recipient) combination leading to primary EBV infection. In comparison with the organ donors, in kidney graft recipients the pre-KTx IgG antibody titers (geometric mean) against EBV-CA were significantly elevated (1 : 428 vs 1 : 574; U-test). Post-KTx, EBV-CA-IgM seroconversion was observed in 29.5 % (52 out of 176) of first graft recipients and in 47.8 % (11 out of 23) of regrafted patients up to the last follow-up day 649. In 219 out of these 52 recipients, IgM abs again cytomegalovirus (CMV) could also be detected; the other 23 did not develop CMV-IgM abs. The most frequently associated clinical signs were fever (74 %), elevated aminotransferases (57 %), and deterioration of graft function (26 %). In the EBV-IgM+/CMV-IgM+ group there were significantly more rejection therapies than in the EBV-IgM+/CMV-IgM− group. With respect to the severity of EBV infections, 68 % were asymptomatic or mild, 27 % moderate, and 4 % (only 1) severe. Thus, besides the post-KTx CMV monitoring, EBV monitoring should also belong to the follow-up checks.
    Type of Medium: Electronic Resource
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