Method of manufacturing semiconductor device
View Patent ↗A semiconductor substrate is inserted into a heat treatment apparatus at a low temperature ranging from room temperature to about 50° C., and organic substances included in a metal on the semiconductor substrate are released without carbonization in an annealing process before CMP. Further, organic substances capable of preventing the corrosion of the metal are decomposed, and the organic substances themselves and chlorine, sulfuric acid, and ammonia which are included in the organic substances are diffused out of the metal film by setting the heat treatment apparatus at a rate of temperature rise of 15° C./min or less until a prescribed heat treatment temperature is reached.
1. A method of manufacturing a semiconductor device, comprising the steps of:
forming recesses in an insulating film on a semiconductor substrate;
burying a metal film in the recesses by plating using a plating solution containing additives;
removing the additives included in the metal film by heat treating the metal film; and
removing the metal film adhering to the insulation film to leave the metal film only in the recesses, wherein;
the heat treatment is conducted by inserting the semiconductor substrate into a heat treatment apparatus at an introducing temperature of 20° C. to 50° C., heating the semiconductor substrate to a desired heat-treating temperature, and holding the semiconductor subtrate at the desired heat-treating temperature for 30 to 120 minutes.
2. The method for manufacturing a semiconductor device according to claim 1 , wherein the metal film is a copper film and the desired heat-treating temperature is from 100° C. to 300° C.
3. The method for manufacturing a semiconductor device according to claim 1 , wherein the heat treatment is conducted in an atmosphere of inert gas or reducing gas.
4. The method for manufacturing a semiconductor device according to claim 1 , wherein a rate of temperature rise from the inserting temperature to the prescribed heat treatment temperature is less than 20° C./min.
5. The method for manufacturing a semiconductor device according to claim 4 , wherein the metal film is a copper film and the desired heat-treating temperature is from 100° C. to 300° C.
6. The method for manufacturing a semiconductor device according to claim 1 , wherein a rate of temperature rise from the inserting temperature to the prescribed heat treatment temperature is 15° C./min or less.
7. The method for manufacturing a semiconductor device according to claim 6 , wherein the metal film is a copper film and the desired heat-treating temperature is from 100° C. to 300° C.