The Effect of Thermal Nitridation-Based Defect Engineering on Phosphorus Diffusion in SiGe:C
Publication Type:Journal Article
Source:J. of Physics D (Submitted)
We report experimental study of thermal nitridation effect on phosphorus (P) diffusion in strained Si(1-x)Gex and strained Si(1-x)Gex:Cy. P diffusivities under thermal nitridation (vacancy injection) and effective inert condition were compared. The result shows that thermal nitridation can retard P diffusion in SiGe with up to 18% Ge content, but the effectiveness of this retardation decreases with increasing Ge and C content. With 18% Ge content and when carbon is present, thermal nitridation slightly increases P diffusivity compared to the inert condition. The Ge dependence can be explained by the increasing contribution from vacancy-assisted mechanism for P diffusion in strained SiGe with increasing Ge content.