1,723,199 research outputs found
Scattering in Nano-Electronic Devices
Get PDFThird generation ultra scaled high-performance MOSFETs are based on High-x Metal gate (HkMG) technology. A new theoretical model for non-ideal metal gate in conjunction with high-x' stack is developed to predict inversion channel
mobility. Impact of surface phonons (originating from high-a- dielectric) on mobility degradation is evaluated using the model, incorporating newly proposed criteria for determining Landau damping regimes.
Phonon-electron interaction- the most dominant scattering mechanism at room and higher temperatures is also studied. It is concluded that the well known trend for phonon limited mobility, observed in measurements, is not observed in the range where surface roughness scattering is negligible, through the existing transport models. A new scheme is proposed in which the scattering phonon deformation potentials are channel density dependent. Empirical fitted parameters successfully reproduce the reported trend and the mobility magnitude fairly matches with the experimental data.
Another prominent scattering mechanism responsible for mobility degradation under strong bias is due to roughness at insulator/substrate interface. The source term responsible for the strongest impact on SR mobility is derived on physical grounds. Universal mobility of a conventional MOSEET is achieved using the phonon and the comprehensive SR model.
Closely related to “normal” SR scattering is the “remote" scattering of carriers at gate/insulator interface. Remote surface scattering (RSR) is significant in ultra-thin MOS structures. The existing RSR model presented by Gamiz et al is modified. It is shown that this modification to the model is necessary in order to observe the full impact of rms height of the amplitude of the roughness.
In summary, except for the low field regime, dominated by Coulomb scattering models have been demonstrated capable of predicting high-field mobility, which is the technologically relevant mobility, in metal gate high-a- dielectric ultra-thin MOSEETs using a quantum mechanical description of the quantization of the inversion layer
Awardees data
No full textThis dataset contains past laureates from the physics field and is used as a benchmark dataset for the study
Visual Pollution: Concepts, Practices and Management Framework
No full textVisual Pollution: Concepts, Practices and Management Framework offers the first substantial cutting-edge exploration of visual pollution in urban settlements, uncovering the conceptualisation, geography-specific visual pollutants, methods of visual pollution assessment and management frameworks. © 2022 Raheel Nawaz and Khydija Wakil. All rights reserved
Rapid manufacturing technique used in the development of a regenerative pump impeller
No full textThis paper presents a method of rapid manufacture used in the development of a regenerative pump impeller. Rapid manufacturing technology was used to create complex impeller blade profiles for testing as part of a regenerative pump optimisation process. Regenerative pumps are the subject of increased interest in industry. Ten modified impeller blade profiles, from the standard radial configuration, were evaluated with the use of computational fluid dynamics and experimental testing. Prototype impellers were needed for experimental validation of the CFD results. The manufacture of the complex blade profiles using conventional milling techniques is a considerable challenge for skilled machinists. The complexity of the modified blade profiles would normally necessitate the use of expensive CNC machining with 5 axis capability. With an impeller less than 75 mm in diameter and a maximum blade thickness of 1.3mm, a rapid manufacturing technique enabled production of complex blade profiles that were dimensionally accurate and structurally robust enough for testing. As more advanced rapid prototyping machines become available in the study in the future, e.g. 3D photopolymer jetting machine, the quality of the parts particularly in terms of surface finish will improve and the amount of post processing operations will reduce. This technique offers the possibility to produce components of increased complexity whilst ensuring quality, strength, performance and speed of manufacture. The ability to manufacture complex blade profiles that are robust enough for testing, in a rapid and cost effective manner is proving essential in the overall design optimisation process for the pump
CCDC 1058510: Experimental Crystal Structure Determination
No full textRelated Article: Ahmad Raheel, Imtiaz-ud-Din, Sohaila Andleeb, Simko Ramadan, Muhammad Nawaz Tahir|2017|Appl.Organomet.Chem.|31|e3632|doi:10.1002/aoc.363
Research and Service Design at the DSC
No full textIn this digital Initiatives speaker series Greg Whistance-Smith and Raheel Malkan share their findings and lessons learned from working with Lydia Zvyagintseva on research and service development, as part of their Graduate Student Internship Program at the University of Alberta Libraries. They focus on defining and developing a plan for data visualization as well as interactive media, two emergent areas in learning organizations
Higher education institutions in the post-Covid era: Transformation through crisis and outstanding issues
No full textThe Covid-19 pandemic certainly was a cause of new challenges, but it has also exacerbated the already-existing weaknesses inherent in the ecosystem of higher education. The scope of institutional adaptation thus required was immense and remains both under-recognized and under-explored in the academic debate. The pace and depth of the transformation have not been even; institutional, political, legal, economic, and cultural factors were at play. No one-size-fits-all strategic approach to Covid-19 and its implications was possible. As law and regulatory efforts follow developments in society, several gaps and loopholes were left unattended in the early stage of the pandemic, thus frequently forcing HEIs to improvise. Notwithstanding the substantial and measurable degree of digital and institutional transformation HEIs attained, the pandemic left the fabric of the community of HEIs ruptured. Against this backdrop, this chapter outlines the key challenges and takeaways and makes a call for action
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