The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2011
Filed:
Nov. 29, 2007
Juri Kato, Chino, JP;
Shunichiro Ohmi, Yokohama, JP;
Juri Kato, Chino, JP;
Shunichiro Ohmi, Yokohama, JP;
Seiko Epson Corporation, Tokyo, JP;
Tokyo Institute of Technology, Tokyo, JP;
Abstract
A method of manufacturing a semiconductor device, comprises; a) forming a SiGe layer on a substrate; b) forming a Si layer on the SiGe layer; c) forming a groove that exposes the side surface of the SiGe layer by partly etching the Si layer and the SiGe layer; and d) forming a hollow portion between the substrate and, the Si layer by etching the SiGe layer via the groove. Step d) further comprises: forming a part of the hollow portion by supplying a new liquid including a fluorinated nitric acid solution to the substrate and etching the SiGe layer, removing the fluorinated nitric acid solution once from the hollow portion that is under formation; and etching the SiGe layer by refilling a new liquid including a fluorinated nitric acid solution to the hollow portion.