Patent ID: 8569864

Claim:
A capacitor structure ( 1 ) for forming a piezo-acoustic resonator, comprising: a lower electrode layer ( 5 ) arranged on a substrate surface ( 31 ) of a substrate ( 3 ); an upper electrode layer ( 6 ); a crystalline zinc oxide-containing dielectric layer ( 2 ) arranged between the electrode layer ( 5 , 6 ), which has a plurality of zinc oxide single crystals each with a polar crystal axis, the polar crystal axes of the zinc oxide single crystals of the dielectric layer being tipped relative to the substrate surface ( 31 ); and an amorphous dielectric intermediate layer ( 4 ) interposed between the lower electrode ( 5 ) and the crystalline zinc oxide-containing dielectric layer ( 2 ), the intermediate layer ( 4 ) having an intermediate layer thickness ( 41 ) of 20 nm to 500 nm.