Shawkat Jubair - Academia.edu (original) (raw)
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Papers by Shawkat Jubair
Journal of Electronic Materials
Maǧallaẗ ǧāmiʻaẗ al-anbār li-l-ʻulūm al-ṣirfaẗ, Dec 1, 2022
Gamma ray spectra have interesting information about energy and intensity of gamma photons. Norma... more Gamma ray spectra have interesting information about energy and intensity of gamma photons. Normally, this information is available in the peak area and background region. A full energy peak sits on a background continuum and produced by full energy absorption of high energy photons, while background region is produced by Compton scattering of the photons. The most essential concern of errors is in the method of determining the events in both peak and background areas. The uncertainty is low when the background counts are small relative to the peak counts. However, it becomes high when the counts of the peak area are low with respect to that of background. The detection threshold for the peak is ultimately determined by the uncertainty in the background counts. This depends on the technique used and the form of the produced spectra. This paper reviews different methods of determining peak area and their associated uncertainties in terms of the principle and application of the techniques used. .
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, Oct 1, 2022
In this project some of the challenges of novel InSb based semiconducting material are investigat... more In this project some of the challenges of novel InSb based semiconducting material are investigated. Various features of electron transport in low dimensional semiconductors were studied for AlInSb/InSb quantum well (QW) two-dimensional electron gas (2DEG) heterostructures with an emphasis placed on realising onedimensional systems (which exhibit quantum phenomena where the conductance takes on a discrete ‘step-like’ nature). This material allows us to take advantage of very extreme material parameters such as light effective mass, the lowest binary material band gap, the highest electron mobility at room temperature, and an extremely large effective g-factor (with associated spin orbit coupling). However, this material still has significant challenges due to the large mismatch between the substrate GaAs and the QW, which produces threading dislocations that lead to limitations in mobility. Surface roughness has been investigated as a result of shallow etching for Ohmic contact depo...
Journal of Electronic Materials
Maǧallaẗ ǧāmiʻaẗ al-anbār li-l-ʻulūm al-ṣirfaẗ, Dec 1, 2022
Gamma ray spectra have interesting information about energy and intensity of gamma photons. Norma... more Gamma ray spectra have interesting information about energy and intensity of gamma photons. Normally, this information is available in the peak area and background region. A full energy peak sits on a background continuum and produced by full energy absorption of high energy photons, while background region is produced by Compton scattering of the photons. The most essential concern of errors is in the method of determining the events in both peak and background areas. The uncertainty is low when the background counts are small relative to the peak counts. However, it becomes high when the counts of the peak area are low with respect to that of background. The detection threshold for the peak is ultimately determined by the uncertainty in the background counts. This depends on the technique used and the form of the produced spectra. This paper reviews different methods of determining peak area and their associated uncertainties in terms of the principle and application of the techniques used. .
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, Oct 1, 2022
In this project some of the challenges of novel InSb based semiconducting material are investigat... more In this project some of the challenges of novel InSb based semiconducting material are investigated. Various features of electron transport in low dimensional semiconductors were studied for AlInSb/InSb quantum well (QW) two-dimensional electron gas (2DEG) heterostructures with an emphasis placed on realising onedimensional systems (which exhibit quantum phenomena where the conductance takes on a discrete ‘step-like’ nature). This material allows us to take advantage of very extreme material parameters such as light effective mass, the lowest binary material band gap, the highest electron mobility at room temperature, and an extremely large effective g-factor (with associated spin orbit coupling). However, this material still has significant challenges due to the large mismatch between the substrate GaAs and the QW, which produces threading dislocations that lead to limitations in mobility. Surface roughness has been investigated as a result of shallow etching for Ohmic contact depo...