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In this paper, the photo-stimulated discharge (PSD) current spectra of polyimide (PI) are obtained by the optical parametric oscillator (OPO) laser to characterize the deep space charge traps in the dielectric materials. The result shows that the energy level of charge traps in the PI film is distributed in 3.10~4.10eV, and the main part concentrates in 3.35~3.85eV. These data can provide experimental...
The charge carrier trap energy level is an important parameter that will affect the electrical and optical properties of insulating and semiconducting materials. Depending on the characterizing methods, it has a remarkable difference. The trap energy levels of two kinds of polyimide films, original (100 HN) and corona-resistant (100 CR) ones produced by Dupont, are estimated by depolarization current,...
Modified isothermal discharge current method (MIDC) was introduced to investigate the trap level distribution in Kapton 100HN and 100CR (nanodielectrics) PI films before and after corona ageing. The physical and chemical changes were studied by AFM and FT-IR respectively. Experiments showed that the quantity of traps was increased evidently after corona ageing and lots of deeper traps were produced...
A new kind of one dimensional (1-D) nano - material was successfully prepared by introducing poly (methyl methacrylate) (PMMA) into a kind of track etch nano-hole polymer films via polymerization. The dielectric characteristics of these nano-materials were investigated by high-voltage device and precision impedance analyzer etc. This kind of 1-D nano - material exhibits a better dielectric strength...
Thermally stimulated current (TSC) is developed and a new method for direct determination of trap level distribution in polymer film is proposed. In this method, a new function is defined to weight the contribution of a trap level to the current at any temperature. The demarcation energy is used to study the trap empty process. Analysis shows that only electrons with trap levels very close to the...
LDPE has been widely used in electrical insulation and high voltage device application. In this paper we have studied the characteristics of electrical tree aging at AC voltage in LDPE, with the continuous applied voltage to observe the propagation of electrical tree. The electrical tree experiments were carried out with needle-plane specimens. At the same time the barriers of different polymer films...
Electrostatic Force Microscope (EFM) was applied to study the origin and decay properties of surface charge on original and corona-resistant Polyimide films in micro-nanometer scale. The surface charge were generated by injecting on the surfaces of the polyimide (PI) films using the conductive probe of EFM. After the surface charge were characterized by EFM, the results indicate that the difference...
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