Reactive ion etching of silicon with hydrogen bromide
First Claim
1. In a method of manufacturing semiconductor IC devices by etching comprising the steps of(a) forming a composite structure by(i) providing a silicon substrate,(ii) forming a thin layer of silicon oxide on said silicon substrate,(iii) forming a polysilicon layer on said oxide,(iv) forming a mask of a photoresist on at least parts of said polysilicon layer,(b) removing any surface oxides from said polysilicon layer with an oxide etching plasma, and(c) then exposing the composite structure to a plasma containing only hydrogen bromide to selectively etch said polysilicon layer relative to said photoresist and said silicon oxide.
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Accused Products
Abstract
A plasma etching process using HBr is set forth in which etching of silicon and polysilicon in IC manufacture is significantly improved by the high etching selectivity for either silicon and polysilicon to both oxides and photoresist materials.
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Citations
13 Claims
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1. In a method of manufacturing semiconductor IC devices by etching comprising the steps of
(a) forming a composite structure by (i) providing a silicon substrate, (ii) forming a thin layer of silicon oxide on said silicon substrate, (iii) forming a polysilicon layer on said oxide, (iv) forming a mask of a photoresist on at least parts of said polysilicon layer, (b) removing any surface oxides from said polysilicon layer with an oxide etching plasma, and (c) then exposing the composite structure to a plasma containing only hydrogen bromide to selectively etch said polysilicon layer relative to said photoresist and said silicon oxide.
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10. A method of manufacturing semiconductors by selectively etching a layer of a silicon-bearing material relative to a mask, comprising the steps of:
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providing a patterned mask of a photoresist over a layer of silicon-bearing material to expose only areas to be etched, removing any surface oxides from said silicon-bearing layer with an oxide etching plasma, and then exposing said silicon-bearing layer to a plasma containing only hydrogen bromide to selectively etch said silicon-bearing layer relative to said mask. - View Dependent Claims (11, 12, 13)
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Specification