Theoretical study on influence of impulity concentration on behavior of a semiconductor electrostatic actuator

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  • 半導体静電アクチュエータの動作に及ぼす不純物濃度の影響に関する理論的検討
  • ハンドウタイ セイデンアクチュエータ ノ ドウサ ニ オヨボス フジュンブツ ノウド ノ エイキョウ ニ カンスル リロンテキ ケントウ

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Influence of impulity concentration on behavior of a semiconductor electrostatic actuator in low frequency drive voltage has been analyzed theoretically. The actuator has a p-type silicon movable electrode supported by cantilever beams and a metal fixed electrode opposing to the movable one. When gap width between the electrodes is fixed, capacitance between them changes depending on the drive voltage and rate of the change increases with decrease of the concentration Na (15% in Na=1014cm-3 and 0.3%in Na=1018cm-3). For Na<1016cm-3, pull-in voltage and release voltage of displacement-voltage curves increases with decrease of the concentration, especially when positive voltage is applied to the fixed electrode. For Na>1016cm-3, the impulity concentration has almost no influences on the behavior of the actuator independent of the polarity of the drive voltage.

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