Invention Grant
- Patent Title: Epitaxially coated silicon wafer and method for producing epitaxially coated silicon wafers
- Patent Title (中): 外延涂覆的硅片及其制造外延硅片的方法
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Application No.: US12493370Application Date: 2009-06-29
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Publication No.: US07935614B2Publication Date: 2011-05-03
- Inventor: Reinhard Schauer , Norbert Werner
- Applicant: Reinhard Schauer , Norbert Werner
- Applicant Address: DE Munich
- Assignee: Siltronic AG
- Current Assignee: Siltronic AG
- Current Assignee Address: DE Munich
- Agency: Brooks Kushman P.C.
- Priority: DE102005045339 20050922
- Main IPC: H01L21/20
- IPC: H01L21/20

Abstract:
A multiplicity of silicon wafers polished at least on their front sides are provided and successively coated individually in an epitaxy reactor by a procedure whereby one of the wafers is placed on a susceptor in the epitaxy reactor, is pretreated under a hydrogen atmosphere at a first hydrogen flow rate, and with addition of an etching medium to the hydrogen atmosphere at a reduced hydrogen flow rate in a second step, is subsequently coated epitaxially on its polished front side, and removed from the reactor. An etching treatment of the susceptor follows a specific number of epitaxial coatings. Silicon wafers produced thereby have a global flatness value GBIR of 0.07-0.3 μm relative to an edge exclusion of 2 mm.
Public/Granted literature
- US20090261456A1 EPITAXIALLY COATED SILICON WAFER AND METHOD FOR PRODUCING EPITAXIALLY COATED SILICON WAFERS Public/Granted day:2009-10-22
Information query
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