Evaluation of energy depth of traps in PA/BaTiO3 composite film by TSC measurements

Recently, composite films of polymer and inorganic-filler are required as a key material for further downsizing of electronic devices such as a capacitor. We have studied, through thermally stimulated current (TSC) measurement, to explain the effects of trap levels on electrical conduction and charging properties of Polyamide(PA)/BaTiO₃ composite films. TSC measurements were performed from 150 K to 350 K. TSC signals were detected for PA, 20 vol% filled PA, and 40vol% filled PA. Trap parameters were accurately evaluated through asymptotic estimation method (AEM). The values of energy depth of charge trap (E_t) for PA, 20 vol% filled PA, and 40vol% filled PA were estimated 0.654 eV, 0.647 eV, and 0.625 eV, respectively. Escape frequency factors (υ) were also estimated 5.28 × 10⁸ s^-1, 1.87 × 10⁷ s^-1, and 3.22 × 10⁷ s^-1, respectively. It was revealed that BaTiO₃ filled in PA films reduced both Et value and υ.