Density-functional theory study of Au, Ag and Cu defects in germanium

Carvalho, A.; Coutinho, J.; Jones, R.; Silva, E.; Oberg, S.; Briddon, P. R.

doi:10.1016/j.mssp.2008.10.007

conference paper

Density-functional theory study of Au, Ag and Cu defects in germanium

Carvalho, A.

•

Coutinho, J.

•

Jones, R.

2008

Materials Science In Semiconductor Processing

International Symposium on Beyond Silicon Technology held at the 2008 EMRS Spring Meeting

Gold, silver and copper defects in germanium are modeled using density functional theory. The structures and electrical properties of the substitutional metals are calculated in excellent agreement with experiment. Interstitial Au, Ag and Cu are found to be shallow donors, in disagreement with a previous assignment of Cui to a hole trap in the lower half of the gap. Substitutional-interstitial metal (M-i-M-s) pairs and metal-vacancy pairs (MS-V) are also investigated. (C) 2008 Elsevier Ltd. All rights reserved.