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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 Ba_0.6Sr_0.4TiO₃ 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 / Ba_0.6Sr_0.4TiO₃ / 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.