Zinc oxide piezoelectric crystal film on sapphire plane
First Claim
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1. A (1120)-plane zinc oxide piezoelectric crystal film being epitaxially grown on a surface of (0112) sapphire and being substantially parallel to the (0112)plane,said zinc oxide piezoelectric crystal film containing Cu in an amount of 0.4 percent to not more than 4.5 percent by weight with respect to the total content of Zn and Cu.
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Abstract
When a zinc oxide piezoelectric crystal film is epitaxially grown on an R-plane sapphire substrate by sputtering, a target containing not more than 4.5 percent by weight of Cu with respect to the total content of Zn and Cu is employed so that the zinc oxide piezoelectric film contains Cu. Thus, it is possible to obtain a zinc oxide piezoelectric crystal film having excellent orientation.
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Citations
13 Claims
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1. A (1120)-plane zinc oxide piezoelectric crystal film being epitaxially grown on a surface of (0112) sapphire and being substantially parallel to the (0112)plane,
said zinc oxide piezoelectric crystal film containing Cu in an amount of 0.4 percent to not more than 4.5 percent by weight with respect to the total content of Zn and Cu.
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6. A piezoelectric crystal device consisting essentially of
a (1120)-plane zinc oxide piezoelectric crystal film epitaxially grown on a surface of (0112) sapphire and being substantially parallel to the (0112)-plane, said zinc oxide piezoelectric crystal film containing Cu in an amount of 0.4 percent to not more than 4.5 percent by weight with respect to the total content of Zn and Cu.
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10. A piezoelectric crystal device consisting of
a (1120)-plane zinc oxide piezoelectric crystal film being epitaxially grown on a surface of (0112) sapphire and being substantially parallel to the (0112)-plane, said zinc oxide piezoelectric crystal film containing Cu in an amount of 0.4 percent to not more than 4.5 percent by weight with respect to the total content of Zn and Cu.
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