Patent ID: 8492187

Claim:
A method of releasing multiple semiconductor device layers from atop a base substrate, said method comprising: forming a multilayered stack on a base substrate, said multilayered stack comprising, from bottom to top, a first sacrificial material layer having a first thickness, a first semiconductor device layer, a second sacrificial material layer having a second thickness, and a second semiconductor device layer, wherein the first thickness is less than the second thickness; and selectively removing said first and second sacrificial material layers by etching, wherein the second sacrificial material layer etches at a faster rate than the first sacrificial material layer, thereby sequentially releasing the second semiconductor device layer followed by the first semiconductor device layer, wherein said first and second sacrificial material layers are comprised of a same semiconductor material as the first and second semiconductor device layers and wherein a first protection layer is formed beneath each semiconductor device layer, and wherein a second protection layer is formed on exposed surfaces of each semiconductor device layer.