Patent ID: 6069073
Filing Date: 2000-05-30
Classification: H01L

Abstract:
A method for forming a diffusion barrier layers, said method comprising the steps of:a) preparing a silicon substrate;b) depositing a refractory metal on an entire surface of said silicon substrate;c) annealing a metal-coated silicon substrate using a sequential two-step thermal processing cycle to form a dual diffusion layers, wherein the two-step thermal processing comprises the steps of:annealing in a low-temperature range in a nitrogen ambient to minimize metal-silicon interaction while maintaining metal-nitrogen interaction and nitrogen diffusion through the metal layer, thereby forming a binary alloy within an upper portion of said dual diffusion layer; andannealing in a high-temperature range in a nitrogen ambient to form a ternary alloy within a lower portion of said dual diffusion layer using an outdiffusion of silicon ions.