Patent ID: 8241940

Claim:
A method for making a pair of monocrystalline thin-film silicon substrates, said method comprising: providing a monocrystalline silicon wafer; patterning a first surface and a second surface of said monocrystalline silicon wafer with a resist layer having a hexagonal pattern; etching said monocrystalline silicon wafer, thereby producing a set of structural surface topography features on said first surface and said second surface, said structural surface topography features comprising a plurality of isolated hexagonal posts; removing said resist layer from said monocrystalline silicon wafer; and cleaning said first surface and said second surface of said monocrystalline silicon wafer, said monocrystalline silicon wafer comprising a double-sided reusable template; producing a first porous silicon layer on said first surface and a second porous silicon layer on said second surface of said double-sided reusable template via an anodic etching process, said porous silicon layers having a crystallinity consistent with said double-sided reusable template; epitaxially depositing a first monocrystalline thin-film silicon substrate on said first porous silicon layer and a second monocrystalline thin-film silicon substrate on said second porous silicon layer, said monocrystalline thin-film silicon substrates having a crystallinity consistent with said porous silicon layers; separating said first and said second monocrystalline thin-film silicon substrates from said first and said second porous silicon layers.