Patent ID: 7776624
Filing Date: 2010-08-17
Classification: H01L,Y10S

Abstract:
1. A semiconductor fabrication method, comprising: providing a semiconductor substrate, wherein the semiconductor substrate comprises a first substrate layer that includes silicon, an oxide layer that includes silicon dioxide and is on and in direct physical contact with the first substrate layer, and a semiconductor substrate layer consisting of an upper portion and a lower portion, wherein a total bottom surface of the lower portion of the semiconductor substrate layer is in direct physical contact with the oxide layer, wherein the lower portion of the semiconductor substrate layer is directly below the upper portion of the semiconductor substrate layer and is sandwiched between the upper portion of the semiconductor substrate layer and the oxide layer, wherein the upper portion of the semiconductor substrate layer comprises a substrate semiconductor material, and wherein the lower portion of the semiconductor substrate layer comprises the substrate semiconductor material; after said providing the semiconductor substrate is performed, removing the upper portion of the semiconductor substrate layer such that the total bottom surface that existed prior to said removing the upper portion of the semiconductor substrate layer remains on and in direct physical contact with the oxide layer; and after said removing the upper portion of the semiconductor substrate layer is performed, epitaxially growing a first semiconductor layer on the lower portion of the semiconductor substrate layer, wherein after said epitaxially growing the first semiconductor layer is performed, a first atomic percent of a first semiconductor material in the first semiconductor layer is equal to a substrate atomic percent of the substrate semiconductor material in the lower portion of the semiconductor substrate layer, wherein the first semiconductor material and the substrate semiconductor material each consist of silicon, wherein said removing the upper portion of the semiconductor structure layer comprises: thermally oxidizing the upper portion of the semiconductor substrate layer to generate a substrate dielectric layer that replaces the upper portion of the semiconductor substrate layer, and removing the substrate dielectric layer.