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Silicon nanomembranes are thin silicon layers that can be released
from their substrates and redeposited on other surfaces. Such membranes are flexible and can be coherently strained, producing tensile strained silicon without the need for dislocation-driven relaxation of a SiGe virutal substrate.
"Elastically Relaxed Free-standing Strained-Si Nanomembranes," Michelle M. Roberts, Levente J. Klein, Don E. Savage, Keith A. Slinker, Mark Friesen, George Celler, Mark A. Eriksson, Max G. Lagally, Nature Materials 5, 388 (2006).

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