Advanced discretisation strategies for atomistic nano CMOS simulation

Lead Research Organisation: Cardiff University
Department Name: Sch of Engineering

Abstract

Vision: The idea of this proof-of-concept research is to investigatehow recent revolutionary advances in computational mechanics can beleveraged to enhance the modelling of nano complementarymetal-oxide-semiconductor (CMOS).The size of the CMOS devices is aggressively being reduced into thedeca-nanometer range (one hundredth of a micron). It isprojected that mass-produced metal-oxide-semiconductor field-effecttransistors (MOSFETs) will reach gate lengths as small as 7 nanometersby 2018 (2003 edition of the International Technology Roadmap forSemiconductors).Modelling and simulation provides deep insight into the operation ofmodern semiconductor devices and circuits, and dramatically reducesthe development costs and time-to-market.Modelling devices at the deca-nanometer scale face significantdifficulties associated with the statistical variability from onetransistor to another introduced by the granularity of matter at thisscale. The Device Modelling Group (Asen Asenov) in the ElectricalEngineering Department at Glasgow University is the world leader inCMOS variability simulation developing unique computational tools tailored tofacilitate the design the next generation of nano-CMOS.While these techniques are very well suited to simulate the effects ofdiscrete dopants, they involve an unnecessary computational cost byrequiring large numbers of grid points when simulating line edge andinterface roughness. It would be greatly beneficial for the practical use simulations of CMOS atthe nano-scale if this computational cost could be reduced.Stephane Bordas, from the Mechanics and Materials Group of the CivilEngineering Department at Glasgow University has developed efficientnumerical techniques which have the potential to significantlydecrease the computational burden through enrichment of the numericalscheme with a priori knowledge about the solution and by allowing theuse of low quality discretisations without sacrificing accuracy.This proof-of-concept research will investigate how the novelnumerical techniques devised in Bordas' group in the context ofmechanics problems can be generalised to increase the accuracy versuscomputational cost ratio in nano-scale CMOS simulators.

Publications

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Chen L (2014) Explicit finite deformation analysis of isogeometric membranes in Computer Methods in Applied Mechanics and Engineering

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Natarajan S (2010) Integrating strong and weak discontinuities without integration subcells and example applications in an XFEM/GFEM framework in International Journal for Numerical Methods in Engineering

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Nguyen V (2013) Nitsche's method for two and three dimensional NURBS patch coupling in Computational Mechanics

 
Description We devised numerical methods to simulate nano-electronic devices. Those methods were tested on simple electronic components and showed that stable results could be obtained.

A second impact was to devise isogeometric boundary element methods in two and three dimensions. This significant breakthrough enables the direct prediction of stresses in linear elastic structures without generating a mesh, directly from the data provided by designers.

This work has had impact on simplifying practical engineering simulations, shape optimisation and the simulation of crack propagation and damage tolerance assessment of complex three-dimensional structures without remeshing, directly from the Computer Aided Design model.

The work could also have impact to simplify the design and creative process if coupled to real-time simulations developed by the team in other projects. Associated with 3D printing technology, the methodology promises to enable fast prototyping directly from CAD, thereby freeing the designer from many of their usual constraints.
Exploitation Route Our findings are already been used by others and are available as open source software on our repository: orbi.lu as well as sourceforge https://sourceforge.net/u/cmechanicsos/profile/ Our codes are downloaded over 7000 times a year. https://sourceforge.net/projects/cmcodes/
Sectors Aerospace, Defence and Marine,Communities and Social Services/Policy,Construction,Creative Economy,Digital/Communication/Information Technologies (including Software),Education,Electronics,Energy,Environment,Healthcare,Manufacturing, including Industrial Biotechology,Culture, Heritage, Museums and Collections

URL http://legato-team.eu/
 
Description We devised numerical methods to simulate nano-electronic devices. Those methods were tested on simple electronic components and showed that stable results could be obtained. A second impact was to devise isogeometric boundary element methods in two and three dimensions. This significant breakthrough enables the direct prediction of stresses in linear elastic structures without generating a mesh, directly from the data provided by designers. This work has had impact on simplifying practical engineering simulations, shape optimisation and the simulation of crack propagation and damage tolerance assessment of complex three-dimensional structures without remeshing, directly from the Computer Aided Design model. The work could also have impact to simplify the design and creative process if coupled to real-time simulations developed by the team in other projects. Associated with 3D printing technology, the methodology promises to enable fast prototyping directly from CAD, thereby freeing the designer from many of their usual constraints. Given the number of yearly downloads of our software (around 7,000) it is not obvious to fully quantify the use of the work. But we know it has been used for shape optimisation and crack propagation simulations already.
First Year Of Impact 2013
Sector Aerospace, Defence and Marine,Creative Economy
Impact Types Economic