| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable capacitance capacitor having capacitance that largely changes due to application of DC bias voltage in an embodiment of the present invention, and having a capacitance value that changes in a small amount over time when the application of the DC bias voltage is continued.SOLUTION: A variable capacitance capacitor element 50 according to an embodiment of the present invention includes a support substrate 51, a first electrode layer 59 provided on the support substrate 51, a second electrode layer 60 provided to face the first electrode layer, and a dielectric layer 61 arranged between the first electrode layer 59 and the second electrode layer 60. In one aspect, the dielectric layer 61 has a main component represented by the composition formula BaSrTiO(0.5≤x≤0.8), and a thickness equal to or less than 200 nm. |
