Patent ID: 8852451

Claim:
A silicon etching solution for etching a dummy gate made of silicon in a process for producing a transistor using a structural body comprising a substrate, and a dummy gate laminate formed by laminating at least a high dielectric material film and the dummy gate made of silicon, a side wall disposed to cover a side surface of the laminate and an interlayer insulating film disposed to cover the side wall which are provided on the substrate, in which the dummy gate is replaced with a metal gate containing hafnium, zirconium, titanium, tantalum or tungsten, said silicon etching solution consisting essentially of 0.1 to 40% by weight of at least one alkali compound selected from the group consisting of ammonia, a diamine and a polyamine represented by the general formula (1), 0.01 to 40% by weight of at least one polyhydric alcohol selected from the group consisting of a polyhydric alcohol represented by the general formula (2), a polyhydric alcohol represented by the general formula (3), a cyclic polyhydric alcohol represented by the general formula (4) and a non-reducing sugar, and 40 to 99.89% by weight of water: H 2 N—(CH 2 CH 2 NH) k —H (1) wherein k is an integer of 2 to 5; H—(CH(OH)) 1 —R (2) wherein l is an integer of 2 to 6; and R is hydrogen or an alkyl group; C—((CH 2 ) m OH) 4 (3) wherein m is an integer of 1 or 2; and (CH(OH)) n (4) wherein n is an integer of 3 to 8.