Patent ID: 7109120
Filing Date: 2006-09-19
Classification: B81B,B81C,H01L

Abstract:
1. A method for forming patterned silicon materials, the method comprising: providing a silicon substrate having a first surface region characterized by a <100> crystal orientation plane and a second surface region characterized by a <100> crystal orientation plane, a thickness of material defined between the first surface region and the second surface region; protecting first selected regions on the first surface region using a first masking layer; protecting second selected regions using a second masking layer, facing the first selected regions, on the second surface region; immersing the silicon substrate into an etching solution; removing first unprotected regions on the first surface and removing second unprotected regions on the second surface to cause removal of a portion the thickness of material in the first unprotected regions and the second unprotected regions using the etching solution to form a plurality of openings formed in the first unprotected regions and the second unprotected regions through an entirety of the thickness of material; forming a first angled surface region and a second angled surface region within each of the plurality of openings, the first angled surface region being characterized by a <111> crystal orientation plane and the second angled surface region being characterized by a <111> crystal orientation plane; forming an intersection of the first angled surface region, the second angled surface region, and a portion of the silicon substrate in the <100> crystal orientation plane; subjecting the angled surface region to the etching solution to cause removal of the portion of silicon substrate in the <100> crystal orientation plane to increase a surface region of the portion of the silicon substrate in the <100> crystal orientation plane within each of the plurality of openings; and forming a substantially vertical portion of the silicon substrate within each of the plurality of openings formed in the thickness of material to form a patterned silicon substrate; removing the first masking layer; removing the second masking layer; and bonding the patterned silicon substrate to a handle substrate.