Energy normalized photon-stimulated discharge spectra of polymer dielectric film
Jinglei Cao · Dianji yu kongzhi xuebao · 2009
In order to characterize accurately the distribution of charge traps on energy in polymer dielectric materials by using Photon-stimulated Discharge(PSD) Spectra,the raw PSD Spectra need to be normalized by the energy of light excitation.The definition of energy normalized PSD Spectra and a practical measurement system are given by analyzing the relation of PSD current,changing from traps and light intensity.The principle of the measurement system is discussed as well composed.The system is composed of a wavelength tunable laser,an optical energy meter,an electrometer and a specimen chamber.The system is controlled by software based on LabVIEW to achieve a linear scan of excitation wavelength and a real-time acquisition of current and light energy.A normalized energy PSD Spectra of Polyethylene Terephthalate(PET) film was measured using the system.It shows that the energy of charge traps in the PET film is mainly distributed in 4.08～5.17 eV,and there is a maximum at 4.22 eV.The magnitude scale of the density of traps near the maximal energy is estimated as about 5×1014 cm-3.