Abstract
Electrostatic phenomena occurring at insulator–metal interfaces are interesting to the fields of electronics. In this study, we examined the surface potential of electrical insulating polyimide (PI) Langmuir–Blodgett (LB) films on metal (Al and Au) electrodes, which were charged at various voltages under a needle-plane electrode system. PI LB films were negatively charged as the biasing voltage applied to the needle-electrode increased. The surface potential saturated when the number of deposited layers was 20–30, and it was dependent on the nature of metal electrode. The interfacial electrostatic space charge at the as-deposited film/metal interface made a significant contribution to the dielectric breakdown of ultra-thin films. As a result, PI LB films deposited on Al electrode were broken at lower voltage than that on Au electrode.
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