PATTERNING OF DOPED POLY-SILICON GATES
First Claim
1. A method for removing at least part of a deposited layer selectively over a substrate underneath, the deposited layer comprising at least one element which is not etchable, the method comprising the steps of:
- depositing a layer comprising at least one element which is able to form at least one of a water-soluble chloride and a water-soluble bromide onto a substrate;
halogenating the element by exposing the deposited layer to a dry etch plasma comprising at least one halogen selected from the group consisting of chlorine and bromine;
removing the halogenated element using a water based wet etch step; and
performing a dry etch step to etch a remaining part of the deposited layer.
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Abstract
A method is provided for the patterning of a stack comprising elements that do not form volatile compounds during conventional reactive ion etching. More specifically the element(s) are Lanthanide elements such as Ytterbium (Yb) and the patterning preferably relates to the dry etching of silicon and/or germanium comprising structures (e.g. gates) doped with a Lanthanide e.g. Ytterbium (Yb doped gates). In case the silicon and/or germanium comprising structure is a gate electrode the silicon and/or germanium is doped with a Lanthanide (e.g. Yb) for modeling the work function of a gate electrode.
16 Citations
15 Claims
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1. A method for removing at least part of a deposited layer selectively over a substrate underneath, the deposited layer comprising at least one element which is not etchable, the method comprising the steps of:
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depositing a layer comprising at least one element which is able to form at least one of a water-soluble chloride and a water-soluble bromide onto a substrate; halogenating the element by exposing the deposited layer to a dry etch plasma comprising at least one halogen selected from the group consisting of chlorine and bromine; removing the halogenated element using a water based wet etch step; and performing a dry etch step to etch a remaining part of the deposited layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification