| 摘要 |
A semiconductor device is provided which has a capacitor insulating film made up of zirconium aliminate being an amorphous film obtained by having crystalline dielectric contain amorphous aluminum oxide and having its composition of Al<SUB>X</SUB>Zr<SUB>(1-X)</SUB>O<SUB>Y</SUB>(0.05<=x<=0.3), hereby being capable of preventing, in a process of forming a capacitor of MIM (Metal Insulator Metal) structure, dielectric breakdown of a capacitor insulating film while a relative dielectric constant of a metal oxide film used as the capacitor insulating film is kept high.
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