| 摘要 |
By cleaning with use of a cleaning liquid that contains 10-30% by mass of hydrogen peroxide, 0.005-10% by mass of a quaternary ammonium hydroxide, 0.005-5% by mass of potassium hydroxide, 0.000005-0.005% by mass of an amino polymethylene phosphonic acid and water, a hard mask (5), an organosiloxane-based thin film (6), dry etching residue (8) and a photoresist (7) can be removed without corroding a low-dielectric-constant interlayer insulating film (4), a wiring material (2) such as copper or an copper alloy, a barrier metal (1) and a barrier insulating film (3). According to preferred embodiments of the present invention, damage to copper wiring lines is suppressed even in cases where an acid is added into the cleaning liquid and significant decomposition of hydrogen peroxide is not caused even in cases where titanium is added into the cleaning liquid. |
