Microwave loss mechanisms in Ba0.25Sr0.75TiO3 thin film varactors
作者： A. Vorobiev , P. Rundqvist , K. Khamchane , S. Gevorgian
DOI: 10.1063/1.1789631
关键词:
摘要: Parallel-plate Au(Pt)∕Ba0.25Sr0.75TiO3∕(Pt)Au thin film varactors were fabricated on high resistance Si substrates and characterized at dc, rf, microwave frequencies. In the frequency range 10–45 GHz show relatively low losses, with loss tangent less than 0.025 45 GHz. Due to thick highly conductive Pt/Au electrodes metal losses are 10%. However, of ferroelectric is still three five times higher that in Ba0.27Sr0.73TiO3 single crystal. The analysis dc field dependences permittivity a wide shows these additional mainly due charged defects. Extrapolation measured (1 MHz) tangents region using power law ω1∕3 good agreement experiment. current through varactor found be controlled by Schottky emission Poole-Frenkel mechanisms depending polarity. mode associated with...
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