[en] 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 -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.
Disciplines :
Electrical & electronics engineering
Author, co-author :
Buca, D.; Research Center Jülich > Institute of Bio- and Nanosystems and JARA—Fundamentals of Future Information Technology
Minamisawa, R. A.; Research Center Jülich > Institute of Bio- and Nanosystems and JARA—Fundamentals of Future Information Technology
Trinkaus, H.; Research Center Jülich > Institute of Bio- and Nanosystems and JARA—Fundamentals of Future Information Technology
Holländer, B.; Research Center Jülich > Institute of Bio- and Nanosystems and JARA—Fundamentals of Future Information Technology
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