Asymmetric leakage in (Ba,Sr)TiO3 nanoparticle/parylene‐C composite capacitors |
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| Authors: | Shyuan Yang Brian R. Tull Nadia K. Pervez Limin Huang Eli S. Leland Daniel A. Steigart Stephen O'Brien Ioannis Kymissis |
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| Affiliation: | 1. Department of Electrical Engineering, Columbia University, 1300 S. W. Mudd Building, 500 West 120th Street, New York, New York 10027;2. Department of Chemistry, City University of New York, City College, 1131 Marshak Building, New York, New York 10031;3. Department of Chemical Engineering, City University of New York, City College, 160 Convent Avenue, Steinman Hall 335, City College of New York, New York, New York 10031 |
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| Abstract: | Nanoparticle polymer composite capacitors have been examined for some time as a route to high performance, printable capacitors. One approach to creating these composites is to use a particle film together with vapor deposited polymers, which can yield high performance, but also forms a structurally asymmetric device. The performance of a nanoparticle (Ba, Sr)TiO3 (BST)/parylene‐C composite capacitor is compared to that of a nanoparticle BST capacitor without the polymer layer under both directions of bias. The composite device shows a five orders of magnitude improvement in the leakage current under positive bias of the bottom electrode relative to the pure‐particle device, and four orders of magnitude improvement when the top electrode is positively biased. The voltage tolerance of the device is also improved and asymmetric (44 V vs. 28 V in bottom and top positive bias, respectively). This study demonstrates the advantage of this class of composite device construction, but also shows that proper application of the device bias in this type of asymmetrical system can yield an additional benefit. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013 |
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| Keywords: | (Ba, Sr)TiO3 capacitors composites nanoparticles parylene‐C thin films |
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