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:
Feb. 09, 1999
Filed:
Mar. 07, 1996
Yuji Fukazawa, Yokohama, JP;
Kunihiro Miyazaki, Yokohama, JP;
Kabushki Kaisha Toshiba, Kawasaki, JP;
Abstract
A silicon wafer is set in a processing bath and an HF water solution and ozone water are respectively supplied from an HF line and ozone water line into the processing bath via an HF valve and ozone water valve to create a mixture. The mixture contains an HF water solution with a concentration of 0.01% to 1% and ozone water with a concentration of 0.1 ppm to 20 ppm, has substantially the same etching rate for silicon and for silicon oxide film and is used at a temperature in the range of 10.degree. to 30.degree. C. The silicon wafer and the silicon oxide film formed on part of the surface of the wafer can be simultaneously cleaned by use of the above mixture.