Multiwavelength micro-Raman analysis of strain in nanopatterned ultrathin strained silicon-on-insulator

Moutanabbir, O.; Reiche, M.; Hähnel, A.; Oehme, M.; Kasper, E.
August 2010
Applied Physics Letters;8/2/2010, Vol. 97 Issue 5, p053105
Academic Journal
We developed a heterostructure to assess accurately the strain evolution upon nanopatterning of 15 nm thick tensile strained silicon-on-insulator (SSOI). Here the long-standing concern of substrate background in micro-Raman analysis was circumvented by the introduction of a Ge layer underneath the buried oxide. Unprecedented insights into the strain behavior in SSOI nanostructures were obtained by combining deep UV and visible micro-Raman probes. We found that the formation of edges results in a strong relaxation near the surface parallel to an increase in the strain at the Si/oxide interface. This disparity in the strain evolution between surface and interface leads to the coexistence of compressive and tensile strained regions within the same structure at a lateral dimension of 50 nm. This heterogeneous distribution of strain should be taken into account in the design and fabrication of SSOI-based nanodevices.


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