Patent ID: 7081384
Filing Date: 2006-07-25
Classification: H01L,Y10S

Abstract:
1. A method of forming a silicon dioxide layer, comprising: providing a semiconductor substrate, the semiconductor substrate including at least one silicon surface region with a curved surface; roughening the surface of the at least one silicon surface region to produce a layer of porous silicon, wherein roughening the surface of the at least one silicon surface region includes forming pores, the pores each having a width of less than 20 nm and a pore depth of less than 20 nm; thermally oxidizing the at least one roughened curved silicon surface region; and oxidizing the at least one silicon surface region to produce an oxidized portion within the semiconductor substrate which ends at a depth, the depth being greater than the pore depth of the pores; wherein the surface regions which are not to be oxidized are covered with a masking layer before roughening the surface of the at least one silicon surface region.