Patent ID: 9202741
Filing Date: 2015-12-01
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor structure, comprising: forming a weakened zone in a donor structure at a predetermined depth to define a transfer layer between an attachment surface of the transfer layer and the weakened zone and a residual donor structure between the weakened zone and a surface opposite the attachment surface of the transfer layer; depositing a metallic layer on the attachment surface of the transfer layer so as to form the metallic layer in place over the attachment surface of the transfer layer and forming a metallic support structure comprising the metallic layer in place on the attachment surface of the transfer layer, the metallic support structure having sufficient stiffness to structurally support the transfer layer; separating the transfer layer from the donor structure at the weakened zone to form a composite substrate comprising the transfer layer and the metallic layer, the transfer layer comprising a transferred first layer of semiconductor material; and growing at least one additional layer of semiconductor material on the transferred first layer of semiconductor material; wherein the metallic layer has a coefficient of thermal expansion (CTE) closely matching a CTE of at least one layer of semiconductor material in the semiconductor structure.