Method for Fabricating A Semiconductor Device Comprising Surface Cleaning
First Claim
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1. A method for fabricating a semiconductor device, the method comprising cleaning contaminants on the surface of a cleaning target layer using an etchant comprising a fluorine (F)-containing species dispersed in an alcohol.
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Abstract
A method for fabricating a semiconductor device including surface cleaning includes forming a gate stack on a semiconductor substrate, cleaning contaminants present on the surface of the semiconductor substrate exposed through a contact hole using an etchant including a fluorine (F)-containing species dispersed in an alcohol, and filling a contact hole with a conductive layer to form a connection contact. The etchant preferably has a low selectivity of 1 or less.
267 Citations
22 Claims
- 1. A method for fabricating a semiconductor device, the method comprising cleaning contaminants on the surface of a cleaning target layer using an etchant comprising a fluorine (F)-containing species dispersed in an alcohol.
- 9. A method for fabricating a semiconductor device, the method comprising cleaning contaminants on the surface of a cleaning target layer exposed through an insulating layer using an etchant comprising a fluorine (F)-containing species dispersed in an alcohol.
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12. A method for fabricating a semiconductor device comprising:
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forming an insulating layer over an underlying layer; selectively etching the insulating layer to form a contact hole exposing the surface of the underlying layer; cleaning the contact hole using an etchant comprising a fluorine (F)-containing species dispersed in an alcohol; and filling the contact hole with a conductive layer. - View Dependent Claims (13)
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14. A method for fabricating a semiconductor device comprising:
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forming a plurality of gate stacks over a semiconductor substrate, each gate stack including a first conductive layer, a spacer on the side of the gate stack, and a capping layer on the top of the gate stack; forming an insulating layer over the gate stacks, thereby filling the region between adjacent gate stacks; etching the insulating layer to form a contact hole by using the spacer and the capping layer as etching barriers; cleaning the contact hole using an etchant comprising a fluorine (F)-containing species dispersed in an alcohol; forming a second conductive layer over the insulating layer to fill the contact hole; and planarizing the second conductive layer to expose the capping layer. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification