Relaxation of strained pseudomorphic SixGe1-x layers on He-implanted Si/δ-Si:C/Si(100) substrates

Buca, D.; Minamisawa, R. A.; Trinkaus, H.; Holländer, B.; Nguyen, N. D.; Loo, R.; Mantl, S.
October 2009
Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p144103
Academic Journal
In this letter we present a method to increase the efficiency of SiGe layer relaxation by He+ ion implantation and annealing. Preferential nucleation of He platelets along a δ-impurity layer grown in the Si substrate below the SiGe layer results in planar localization and homogenization of dislocation loop sources inducing a more uniform distribution of misfit dislocations. We demonstrate this for a thin Si:C layer grown by reduced pressure chemical vapor deposition. The optimization of the conditions for efficient relaxation and layer quality is studied with respect to the position of the Si:C layer and the process parameters. Relaxation degrees up to 85% are obtained for Si0.77Ge0.23 layers.


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