Patent ID: 7811936

Claim:
A method of producing a semiconductor device having an interconnection structure disposed above a substrate, said interconnection structure comprising an interconnection and an insulator layer including a low-permittivity layer, said method comprising: forming openings in the insulator layer to expose a surface of the interconnection by a dry etching; cleaning the surface of the interconnection and the openings in the insulator layer; and forming another interconnection, after said cleaning, by filling a conductor material into the openings, said cleaning including: a first cleaning process using a fluorine compound as a first cleaning liquid; a rinsing process using a rinsing liquid including water and a carbonic acid or organic acid; and a second cleaning process using a neutral or alkaline hydrogen aqueous solution as a second cleaning liquid that is supplied to the surface of the interconnection and the openings in the insulator layer, wherein the hydrogen aqueous solution is formed by water into which hydrogen gas is dissolved, and the low-permittivity layer includes silicon.