Diffusion simulating method
AssigneeNEC Corporation
InventorHironori Sakamoto
Life of this patent
Estimating the term…
Abstract
A diffusion simulating method which is capable of defining an impurity flux even if one impurity in one material region is changed into plural types of impurities in the other material region on a material interface. For simulating the diffusion of the impurities in a system which includes a first material region, a second material region and a interface disposed between the first material region and the second material region, impurity flux J(i.sub.A,j.sub.B) on the A/B interface is defined between optional impurity i.sub.A in material region A and optional impurity j.sub.B in material region B. Then, total fluxes J.sup.total (i.sub.A), J.sup.total (j.sub.B) of each type of impurity are determined and added to impurity diffusion equations, and simultaneous equations are set up by these diffusion equations and solved.
Claims9
A diffusion simulating method for simulating diffusion of impurity in a system which includes a first material region, a second material region having at least a first impurity, and an interface disposed between said first material region and said second material region, said method comprising:
- defining impurity fluxes on said interface between at least a second impurity in said first material region and at least a second impurity in said second material region, the impurity fluxes defined based on an impurity concentration in said interface;
- executing a simulation of the diffusion of impurity in accordance with said impurity fluxes;
- and
- producing a design specification based on the simulation.
A diffusion simulating method for simulating a diffusion of impurities in a system which includes a first material region, a second material region having a first impurity, and an interface disposed between said first material region and said second material region, said method comprising:
- defining impurity fluxes on said interface between at least a second impurity in said first material region and at least a second impurity in said second material region;
- determining a total amount of the flux of each impurity from said defined impurity fluxes based on an impurity concentration in said interface;
- adding said total amount of the flux of each impurity to a diffusion equation of the impurity in said first material region and a diffusion equation of the impurity in said second material region;
- setting up simultaneous equations by said impurity diffusion equations and solving the simultaneous equations;
- and
- producing a design specification based on the solved equations.
A diffusion simulating method for simulating a diffusion of impurities in a system which includes a first material region, a second material region, and a first interface disposed between said first material region and said second material region, said method comprising:
- setting an imaginary intermediate layer at a position of said first interface;
- defining impurity fluxes between an impurity in said first material region and an impurity in said intermediate layer on a second interface between said first material region and said intermediate layer based on an impurity concentration;
- determining a total amount of the flux of each type of impurity from said defined impurity fluxes;
- adding said total amount of the flux of each type of impurity to a diffusion equation of the impurity in said first material region, a diffusion equation of the impurity in said second material region and a diffusion equation of the impurity in said intermediate layer;
- setting up simultaneous equations by said diffusion equations and solving the simultaneous equations;
- and
- producing a design specification based on the solved equations.
A computer-readable medium in which a program for simulating a diffusion of impurities in a system which includes a first material region, a second material region, and an interface disposed between said first material and said second material region is stored, said medium storing the program for allowing a computer to execute:
- defining impurity fluxes on said interface between an impurity in said first material region and an impurity in said second material region based on an impurity concentration in said interface;
- determining a total amount of the flux of each impurity from said defined impurity fluxes;
- adding said total amount of the flux of each impurity to a diffusion equation of the impurity in said first material region and a diffusion equation of the impurity in said second material region;
- setting up simultaneous equations by said diffusion equations and solving the simultaneous equations;
- and
- displaying the solved equations for use in a design specification.
A computer-readable medium in which a program, for simulating a diffusion of impurities in a system which includes a first material region, a second material region, and a first interface disposed between said first material region and said second material region is stored, said medium storing the program for allowing a computer to execute:
- setting an imaginary intermediate layer at a position of said first interface;
- defining impurity fluxes between an impurity in said first material region and an impurity in said intermediate layer on a second interface between said first material region and said intermediate layer based on an impurity concentration;
- defining impurity fluxes between an impurity in said second material region and an impurity in said intermediate layer on a third interface between said second material region and said intermediate layer based on an impurity concentration;
- determining a total amount of the flux of each impurity from said defined impurity fluxes;
- adding said total amount of the flux of each impurity to a diffusion equation of the impurity in said first material region, a diffusion equation of the impurity in said second material region, and a diffusion equation of the impurity in said intermediate layer;
- setting up simultaneous equations by said diffusion equations and solving the simultaneous equations;
- and
- displaying the solved equations for use in a design specification.
Dependencies are inferred from the claim text.