Wetting agent for semiconductors, and polishing composition and polishing method employing it
To provide a wetting agent for semiconductors and a polishing composition whereby the wettability of a semiconductor substrate surface can be improved, and microdefects such as particle attachments can be remarkably reduced. A wetting agent for semiconductors, comprising a water soluble polymer compound having a low viscosity and water, and a polishing composition. A 0.3 wt % aqueous solution of the water soluble polymer compound has a viscosity of less than 10 mPa·s at 25° C.
1. A wetting agent for semiconductors, which comprises water and a water soluble polymer compound, wherein
a 0.3 wt % aqueous solution of the water soluble polymer compound has a viscosity of less than 10 mPa·s at 25° C.,
and wherein a 1.3 wt % aqueous solution of the water soluble polymer compound has a turbidity of less than 2.0.
2. The wetting agent for semiconductors according to claim 1 , wherein the water soluble polymer compound is a hydroxy ethyl cellulose having an average molecular weight of from 100,000 to 2,000,000 as calculated as the polyethylene oxide.
3. A method for wetting a semiconductor substrate, which comprises wetting a surface of the semiconductor substrate with the wetting agent of claim 1 .
4. The wetting agent for semiconductors according to claim 1 , wherein the water soluble polymer compound is at least one member selected from the group consisting of a hydroxy ethyl cellulose, a hydroxy propyl cellulose, a polyvinyl alcohol, a polyvinyl pyrrolidone and pullulan.
5. The wetting agent for semiconductors according to claim 1 , wherein the amount of water soluble polymer compound is from 0.005 to 0.1 wt %.
6. A polishing composition concentrate, which comprises water, a water soluble polymer compound in an amount of from at least 0.06 wt % to at most 0.80 wt %, colloidal silica and an alkaline compound, wherein a 0.3 wt % aqueous solution of the water soluble polymer compound has a viscosity of less than 10 mPa·s at 25° C., and wherein a 1.3 wt % aqueous solution of the water soluble polymer compound has a turbidity of less than 2.0.
7. The polishing composition concentrate according to claim 6 , wherein a 0.3 wt % aqueous solution of the water soluble polymer has a viscosity of from 1.0 to 7.0 mPa·s at 25° C.
8. A polishing composition comprising water and a water soluble polymer compound wherein
0.3 wt % aqueous solution of the water soluble polymer compound has a viscosity of less than 10 mPa·s at 25° C.,
and wherein 1.3 wt % aqueous solution of the water soluble polymer compound has a turbidity of less than 2.0.
9. A method for polishing a semiconductor substrate, which comprises polishing a surface of the semiconductor substrate with the polishing composition of claim 8 .
10. A wetting agent concentrate for semiconductors, which comprises water and a water soluble polymer compound wherein a 0.3 wt % aqueous solution of the water soluble polymer compound has a viscosity of from 1.0 to 10.0 mPa·s at 25° and wherein a 1.3 wt % aqueous solution of the water soluble polymer compound has a turbidity of less than 2.0.