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Calculation of theoretical capacitance–voltage characteristics of 6H–SiC metal–oxide–semiconductor structures (2000)

Raynaud, C.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 88 (2000), S. 424-428

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The effect of nonuniform interface trap distributions on capacitance–voltage (C–V) characteristics of 6H–silicon carbide metal–oxide–semiconductor (MOS) capacitors has been investigated. Theoretical C–V curves have been calculated in order to study the influence of: (i) the nature (donor or acceptor) of the traps, (ii) the interface state density peak in the band gap and the peak magnitude. The incomplete ionization of dopants and the depletion in the polysilicon gate have also been taken into account to fit experimental data. A good agreement is observed between the interface state spectrum obtained in our calculation and the one obtained by the Terman's method. Thus, exact parameters of the MOS structures can be obtained. A peak of donor states is detected at Ev+0.65 eV, and an effective oxide charge is measured to 4.9×1012 cm−2, which denotes a poor SiO2–SiC interface quality. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.373676

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Evaluation of 3 dimensional space and time filtering on ECG gated 201Tl myocardial images (1987)

Bourguignon, Michel H. ; Valette, Héric ; Guludec, D. ; [et al.]

Springer

European journal of nuclear medicine 13 (1987), S. 278-282

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ISSN: 1619-7089

Keywords: ECG gated scintigraphy ; 201Tl space and time filter

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Stress 201Tl myocardial images were obtained using a standard ECG gated acquisition protocol for 10 min per view. These images were filtered using a three dimensional space and time filter. The effects of filtering were evaluated by sectorial analysis. Comparing raw and filtered dynamic images, quantification demonstrated that filtering did not produce artefacts. A conventional static image was also obtained as the sum of the series of unfiltered dynamic images. Comparison of raw static and filtered diastolic images indicated that the latter demonstrated myocardial abnormalities more clearly (P〈0.01) in 33 patients. Improvement in the signal to noise ratio produced by filtering made cinematic display and visual analysis possible which was not feasible with raw gated images. Clinical evaluation is in progress.