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:
Dec. 30, 2003
Filed:
Nov. 28, 2001
Shoji Akiyama, Annaka, JP;
Norihiro Kobayashi, Annaka, JP;
Masaro Tamatsuka, Annaka, JP;
Takatoshi Nagoya, Annaka, JP;
Shin-Etsu Handotai Co., Ltd., Tokyo, JP;
Abstract
There is provided a manufacturing process for an annealed wafer capable of reducing boron contamination occurring while annealing is performed in a state where a wafer surface after cleaning is exposed to a gas in Ar atmosphere to suppress a change in resistivity due to an increase in a boron concentration in the vicinity of the wafer surface after annealing and manufacture an annealed wafer in which a difference in a boron concentration between a surface layer portion thereof and a bulk portion thereof is essentially not a problem even if a silicon wafer having a comparative low boron concentration (1×10 atoms/cm or less) is used as the annealed wafer. The manufacturing process for an annealed wafer comprises: cleaning a silicon wafer; and loading the silicon wafer into a heat treatment furnace to heat-treat the silicon wafer in an Ar atmosphere, wherein an aqueous solution including hydrofluoric acid is used as a final cleaning liquid in the cleaning.