Patent ID: 11952268
Assignee: LAWRENCE SEMICONDUCTOR RESEARCH LABORATORY, INC.
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC B | IPC B

Claim 11:
12. A method of forming a free-standing microstructure comprising:
forming an engineered substrate, wherein forming the engineered substrate includes:
growing a monocrystalline silicon-germanium (Si1-xGex) material over a silicon substrate, the Si1-xGex material having a lattice constant different from a lattice constant of the silicon substrate;
relaxing the monocrystalline Si1-xGex material by forming a plurality of dislocations and causing the monocrystalline Si1-xGex material to be substantially free of residual strain;
growing a monocrystalline silicon film over the monocrystalline Si1-xGex material;
relaxing the monocrystalline silicon film by forming a plurality of dislocations and causing the monocrystalline silicon film to be substantially free of residual strain;

forming an opening through the monocrystalline silicon film;
removing at least a portion of the monocrystalline Si1-xGex material from between the monocrystalline silicon film and the silicon substrate to form one or more voids.