Patent ID: 7297569
Filing Date: 2007-11-20
Classification: H01L

Abstract:
1. A method of making a semiconductor device having at least one predetermined epitaxial region with reduced defect density comprising the steps of: (a) forming a dielectric cladding region on a major surface of a single crystal body of a first material; (b) forming a first opening that extends to a first depth into the cladding region; (c) forming a smaller second opening, within the first opening, that extends to a second depth greater than the first depth and that exposes an underlying portion of the major surface of the single crystal body; (d) epitaxially growing regions of a second semiconductor material in each of the openings and on the top of the cladding region; (e) controlling the dimensions of the second opening so that defects tend to be confined to a first epitaxial stem region grown within the second opening and to epitaxial regions overgrown on top of the cladding region, a first predetermined region being located within the first opening and being essentially free of defects; (f) planarizing the top of the device to remove all epitaxial overgrown regions that extend above the top of the cladding layer, thereby making the top of the first predetermined region grown in the second opening essentially flush with the top of the cladding region; and (g) performing additional steps to complete the fabrication of the device.