SUBSTRATE PROCESSING METHOD AND STORAGE MEDIUM

PROBLEM TO BE SOLVED: To provide a technique to align an etching amount when a SiGe layer formed to a wafer is selectively etched with respect to at least one of a Si layer, a SiOlayer and a SiN layer.SOLUTION: When a SiGe layer 100 is etched by side etching in a wafer W that includes the SiGe layer...

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Bibliographic Details
Main Authors TAKAHASHI NOBUHIRO, ASADA YASUO, MATSUNAGA JUNICHIRO
Format Patent
LanguageEnglish
Japanese
Published 01.11.2018
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Summary:PROBLEM TO BE SOLVED: To provide a technique to align an etching amount when a SiGe layer formed to a wafer is selectively etched with respect to at least one of a Si layer, a SiOlayer and a SiN layer.SOLUTION: When a SiGe layer 100 is etched by side etching in a wafer W that includes the SiGe layer 100 and a Si layer 101 alternately stacked therein and exposed in a recess 103, ClFgas and HF gas are simultaneously supplied to the wafer W. Accordingly, an etching rate for each SiGe layer 100 is uniformized, so that an etching amount for each SiGe layer 100 can be aligned.SELECTED DRAWING: Figure 6 【課題】ウエハに形成されたSiGe層を、Si層、SiO2層及びSiN層の内の少なくとも一種に対して選択的にエッチングするにあたって、エッチング量を揃える技術を提供すること。【解決手段】交互に積層されたSiGe層100とSi層101とが凹部103内に露出したウエハWにおいてSiGe層100をサイドエッチングによりエッチングするにあたって、ウエハWにClF3ガスとHFガスとを同時に供給している。そのため各SiGe層100のエッチング速度が均一になり、各SiGe層100のエッチング量を揃えることができる。【選択図】図6
Bibliography:Application Number: JP20170065965