Patent ID: 8008193

Claim:
A manufacturing method of a semiconductor device, comprising the steps of: (a) forming a semiconductor element over a first main surface of a semiconductor substrate having the first main surface and a second main surface opposite to each other along a thickness direction; (b) depositing a first metal film over the second main surface of the semiconductor substrate; (c) carrying out heat treatment to alloy the interface between the first metal film and the semiconductor substrate and thereby form a first conductor film; (d) depositing a second conductor film to cover the first conductor film therewith; and (e) depositing a third conductor film to cover the second conductor film therewith, wherein in the step (d), the second conductor film is deposited using a conductor film having nickel as a principal component, wherein in the step (e), the third conductor film is deposited using a conductor film having gold as a principal component, wherein the step (c) is performed after the step (b) but at least prior to the step (d), and wherein the steps (b) to (e) are performed in the same processing apparatus in order to prevent exposure of the semiconductor substrate to the atmosphere during the steps, wherein in the step (b), a first metal film is deposited using a metal film having nickel as a principal component, wherein in the step (c), the heat treatment is carried out while supporting the semiconductor substrate with a support containing quartz, further including, after the step (b) but prior to the step (d), a step of: (f) depositing a fourth conductor film over the second main surface of the semiconductor substrate, wherein in the step (d), the second conductor film is deposited over the fourth conductor film, and wherein in the step (f), the fourth conductor film is deposited using a conductor film having titanium or tungsten or a compound thereof as a principal component, wherein the step (c) is performed after the step (b) but prior to the step (f), and wherein in the step (f), the fourth conductor film is deposited so as to cover the first conductor film over the second main surface of the semiconductor substrate, further including, after the step (a) prior to the step (b), a step of: (g) grinding the second main surface of the semiconductor substrate to thin the semiconductor substrate, and wherein in the step (d), the second conductor film is deposited while cooling the semiconductor substrate.