title: Point defect engineering strategies to retard phosphorous diffusion in germanium.
abstract: The diffusion of phosphorous in germanium is very fast, requiring point defect engineering strategies to retard it in support of technological application. Density functional theory corroborated with hybrid density functional calculations are used to investigate the influence of the isovalent codopants tin and hafnium in the migration of phosphorous via the vacancy-mediated diffusion process. The migration energy barriers for phosphorous are increased significantly in the presence of oversized isovalent codopants. Therefore, it is proposed that tin and in particular hafnium codoping are efficient point defect engineering strategies to retard phosphorous migration.
authors.affiliation: Department of Materials, Imperial College London, London SW7 2AZ, UK. hassan.tahini09@imperial.ac.uk
authors.forename: H A
authors.initials: HA
authors.lastname: Tahini
authors.forename: A
authors.initials: A
authors.lastname: Chroneos
authors.forename: R W
authors.initials: RW
authors.lastname: Grimes
authors.forename: U
authors.initials: U
authors.lastname: Schwingenschlögl
authors.forename: H
authors.initials: H
authors.lastname: Bracht