Electroless deposition process on a silicon contact
First Claim
1. A composition of an activation solution, comprising:
- a cobalt source at a concentration within a range from about 1 mM to about 100 mM;
a fluoride source at a concentration within a range from about 10 mM to about 400 mM; and
a hypophosphite source at a concentration within a range from about 5 mM to about 150 mM.
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Abstract
Embodiments as described herein provide methods for depositing a material on a substrate during electroless deposition processes, as well as compositions of the electroless deposition solutions. In one embodiment, the substrate contains a contact aperture having an exposed silicon contact surface. In another embodiment, the substrate contains a contact aperture having an exposed silicide contact surface. The apertures are filled with a metal contact material by exposing the substrate to an electroless deposition process. The metal contact material may contain a cobalt material, a nickel material, or alloys thereof. Prior to filling the apertures, the substrate may be exposed to a variety of pretreatment processes, such as preclean processes and activations processes. A preclean process may remove organic residues, native oxides, and other contaminants during a wet clean process or a plasma etch process. Embodiments of the process also provide the deposition of additional layers, such as a capping layer.
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Citations
16 Claims
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1. A composition of an activation solution, comprising:
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a cobalt source at a concentration within a range from about 1 mM to about 100 mM; a fluoride source at a concentration within a range from about 10 mM to about 400 mM; and a hypophosphite source at a concentration within a range from about 5 mM to about 150 mM. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification