Performance of ferroelectric based tunable capacitors as a function of electrode geometry
作者:
T.V. Rivkin,
C.M. Carlson,
P.A. Parilla,
D.S. Ginley,
期刊:
Integrated Ferroelectrics
(Taylor Available online 2000)
卷期:
Volume 29,
issue 3-4
页码: 215-223
ISSN:1058-4587
年代: 2000
DOI:10.1080/10584580008222240
出版商: Taylor & Francis Group
关键词: Keywords: BST; microwave; electrodes; strain; transition temperature
数据来源: Taylor
摘要:
High quality Ba0.4Sr0.6TiO3and SrTiO3films were grown by Pulsed Laser Deposition on single crystal LaAlO3and MgO substrates. Temperature dependencies of the dielectric constant and loss tangent of the films were studied using planar interdigitated test capacitors with various electrode geometries. The temperature where the maximum or “peak” capacitance occurs (Tpand referred to as the “peak temperature”) is found to depend on the electrode geometry in these films. As much as 40 K difference in Tpwas observed between the STO test capacitors with 5 μm and 40 μm gaps between electrodes. Interface built-in electric field and metal-ferroelectric thermal mismatch strain are considered as possible explanation of the effect of electrode geometry on peak temperature of the capacitors.
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