Patent ID: 7153767

Claim:
A chemical mechanical polishing method which comprises forming a chemical mechanical polishing stopper film comprising at least one organic polymer on an insulating film so that the stopper film is interposed between the insulating film and a metal film to be removed by chemical mechanical polishing, and then removing the metal film with a polishing fluid, wherein said stopper film has a dielectric constant of 4 or lower, and wherein said organic polymer is at least one member selected from the group consisting of polymers having repeating structural units represented by the following general formulae (1) and (2): wherein R 7 to R 11 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a cyano group, a nitro group, an alkoxyl group having 1 to 20 carbon atoms, an aryl group, or a halogen atom; X is at least one member selected from the group consisting of groups represented by —CQQ′- (wherein Q and Q′ may be the same or different and each represent a halogenoalkyl group, an alkyl group, a hydrogen atom, a halogen atom, or an aryl group) and a fluorenylene group; Y is at least one member selected from the group consisting of —O—, —CO—, —COO—, —CONH—, —S—, —SO 2 —, and a phenylene group; a is 0 or 1; b to f each are an integer of 0 to 4; g is 5 to 100 mol %; h is 0 to 95 mol %; i is 0 to 95 mol % (provided that g+h+i=100 mol %); j is 0 to 100 mol %; and k is 0 to 100 mol % (provided that j+k =100 mol %).