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DF: Fachverband Dielektrische Festkörper
DF 10: Nano- and microstructured dielectrics
DF 10.6: Talk
Wednesday, March 16, 2011, 12:20–12:40, MÜL Elch
Advancement of Ba0.6Sr0.4TiO3 varactors by MgO micro dots — •Stefan Hirsch1, Yuliang Zheng2, Shunyi Li1, Philipp Komissinskiy1, Andreas Klein1, Rolf Jakoby2, and Lambert Alff1 — 1TU Darmstadt, Institut für Materialwissenschaft, Darmstadt, Germany — 2TU Darmstadt, Institut für Elektrotechnik, Darmstadt, Germany
We report on the improvement of high frequency losses of Pt / Ba0.6Sr0.4TiO3 / Pt thin film parallel plate varactors with MgO micro dots produced by pulsed laser deposition. Varactors are measured at frequencies from 1 MHz to 10 GHz. At 1 MHz losses are reduced by 30 % by using MgO micro dots in the BSTO layer. The figure of merit of the varactor is increased by 25 %. The influence of size and geometry of the micro dots on the varactor properties is investigated. The authors thank DFG GK 1035.