Patent ID: 8936996
Filing Date: 2015-01-20
Classification: H01L

Abstract:
1. A method for semiconductor manufacturing, comprising: forming a semiconductor oxide layer on a top surface of a semiconductor substrate using a first thermal oxidation; patterning the semiconductor oxide layer; performing a second thermal oxidation of the patterned semiconductor oxide layer to form a semiconductor oxide layer having features; planarizing an exposed surface of the semiconductor oxide layer having features to provide a feature-containing semiconductor oxide layer having an entirely planar surface that is opposite a surface containing said features; bonding a semiconductor surface of a handle substrate directly to the entirely planar surface of the feature-containing semiconductor oxide layer to form a semiconductor structure containing from bottom to top, said semiconductor substrate, said feature-containing oxide layer and said handle substrate, wherein said feature-containing oxide layer entirely separates said semiconductor substrate from said handle substrate; inverting said semiconductor structure to provide an inverted structure of, from bottom to top, said handle substrate, said feature-containing semiconductor oxide layer, and said semiconductor substrate; and planarizing an exposed surface of the semiconductor substrate of the inverted structure providing an active semiconductor layer, said feature-containing semiconductor oxide layer is a continuous layer spanning an entire length of the active semiconductor layer and said handle substrate, and wherein an entirety of the feature-containing semiconductor oxide layer is located beneath an exposed surface of the active semiconductor layer, and the feature-containing semiconductor oxide layer is located between the active semiconductor layer and the handle substrate and wherein said surface containing said features is non-planar, located above said entirely planar surface, and is in direct contact with said active semiconductor layer.