Patent ID: 7052994

Claim:
A method for manufacturing a semiconductor device comprising: forming a first N region and a P region on a substrate, forming wiring so as to connect one or both of the first N and the P regions; and performing a processing step on a semiconductor substrate on which the upper surface of said wiring is exposed using a liquid applied to said semiconductor substrate and a light source radiating light onto said semiconductor substrate, wherein said processing step is performed in a state in which the wavelength of light radiated onto said semiconductor substrate is 500 nm to less than 1 μm, wherein said processing step is a cleaning step performed during, before or after a step that includes chemical mechanical polishing (CMP) for forming said wiring, said wavelength of light radiated onto said semiconductor substrate being 500 nm to less than 1 μm in order to reduce an electromotive force at a PN junction in said semiconductor substrate, thereby inhibiting galvanic effects due to photoexcitation before, during or after said step including CMP, and preventing oxidation of a surface of said wiring, wherein the exposing of the upper surface of said wiring of the semiconductor substrate to the liquid is performed concurrently with the exposing of the upper surface of said semiconductor substrate to the light source radiating light.