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Effect of K 0.5 Na 0.5 NbO 3 filling particles on the charge carrier trap distribution of polyimide films
Author(s) -
Lin Jiaqi,
Xie Zhibin,
Yang Wenlong,
Zhang Panpan,
Liu Ying,
Lin Hui,
Li Xiaokang
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39828
Subject(s) - materials science , polyimide , analytical chemistry (journal) , composite number , charge carrier , dispersion (optics) , polymerization , composite material , polymer , layer (electronics) , chemistry , optics , physics , optoelectronics , chromatography
Polyimide (PI) films filled with K 0.5 Na 0.5 NbO 3 (KNN50) particles at different weight 0, 5, 10, and 15 wt % had been prepared by in‐situ dispersion polymerization process. The thermally stimulated current (TSDC) method was used to investigate the charge carrier trap levels and their distribution of the composite films. The TSDC spectra show that pure film has α ‐peaks and β ‐peak, but the composite films only have α ‐peaks and an extraordinary peak at high temperature region. The trap parameters were calculated by an approximate model, and the results indicate that charge released of the shallow traps show a nonlinear behavior. The trap energies decrease from 0.879–0.968 eV to 0.549–0.839 eV with the increase of the KNN50 content. The surface and interface between KNN50 and PI matrix was considered to the variation of the trap levels. The extraordinary peak of the composite films was correlated with the phase transition of the KNN50 particles. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39828.