Space Charge Formation in Polyimide Film under DC Stress with Visible Light Irradiation

Abstract

The pulsed electro-acoustic (PEA) method has been widely used to observe a space charge distribution in various solid dielectric materials. In this report we applied the method to an investigation of the space charge behavior under a high electric filed with a visible light irradiation. It is well known that a property of the conduction in dielectric materials is affected by the irradiation of light. To observe the effect of the light irradiation on the space charge distribution in polyimide, we measured the time dependent space charge distribution under the irradiation of the visible light using three kind of LED.