Patent ID: 8791026

Claim:
A method of treating a substrate including a base substrate, a silicon film on the base substrate and a silicon oxide film on the silicon film, the method comprising: providing a first nozzle unit configured to supply a first fluid, which is a first etchant for etching the silicon oxide film, to a surface of the substrate; scanning the first nozzle unit linearly and supplying the first fluid to the surface of the substrate through the first nozzle unit from one end of the substrate to opposite end of the substrate in a first time period; and providing a second nozzle unit configured to supply a second fluid, which is a second etchant for etching the silicon oxide film, has different ingredients as compared to the first fluid, and has higher etching rate with respect to the silicon oxide film than that of the first fluid, to the surface of the substrate; scanning the second nozzle unit linearly and supplying the second fluid to the surface of the substrate through the second nozzle unit from said one end of the substrate to said opposite end of the substrate in a second time period, which is different from the first time period; providing a third nozzle unit configured to supply a third fluid containing water to the surface of the substrate; and scanning the third nozzle unit linearly and supplying the third fluid to the surface of the substrate through the third nozzle unit from said one end of the substrate to said opposite end of the substrate in a third time period, which is different from the first and second time periods, wherein the first through third time periods overlap at least partially each others.