Patent ID: 11970672
Assignee: YOUNG CHANG CHEMICAL CO., LTD
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B  H | IPC B  C  H

Claim 0:
1. A method of cleaning a semiconductor wafer, the method comprising: (a) immersing a semiconductor wafer in a cleaning composition for 100 to 500 seconds; and (b) washing the semiconductor wafer taken out from the cleaning composition with deionized water,
wherein the cleaning composition comprises:
(a) 3% to 50% by weight of nonionic surfactants represented by Formulas 1 and 2 having a weight ratio in a range of 3:1 to 1:3, respectively;
(b) 0.1% to 1% by weight of an inorganic acid; and
(c) the remaining proportion of water,
wherein the Formula 1 is composed of Formula a1 or Formula a2, the Formula a1 is CnH2n+1-O-(EO)x-H (n=2, x=12, EO=oxyethylene group), and the Formula a2 is CnH2n+1-O-(EO)x-H (n=16, x=12, EO=oxyethylene group),
wherein the Formula 2 is composed of Formula b1 or Formula b2, the Formula b1 is CnH2n+1-(EO)x-H (n=10, x=8, EO=oxyethylene group), and the Formula b2 is CnH2n+1-(EO)x-H (n=13, x=8, EO=oxyethylene group), and
wherein the inorganic acid is one acid selected from a group consisting of phosphoric acid, nitric acid, sulfuric acid, or a mixture of two or more acids selected from the group.