Effect of dipoles on electrical conduction in polymers. I, Numerical calculation

• Published in: Japanese Journal of Applied Physics Vol. 29; no. 8; pp. 1506 - 1510
• Main Authors: KANEKO, K, SUZUOKI, Y, MIZUTANI, T, IEDA, M
• Format: Journal Article
• Language: English
• Published: Tokyo Japanese journal of applied physics 01.08.1990
• Subjects: Applied sciences; Electrical, magnetic and optical properties; Exact sciences and technology; Physical properties; Polymer industry, paints, wood; Properties and testing; Technology of polymers; Dipole; Electrical conductivity; Electrical properties; Vinylidene fluoride polymer
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/jjap.29.1506

Current-time ( J - t ) characteristics for polar polymers were simulated by using a simple one-carrier model including dipoles with the relaxation time τ. When τ was much smaller than the carrier transit time t 0 under an average field, either the current showed a peak resembling a space-charge-limited-current (SCLC) peak in a nonpolar material even when the injection field was not reduced to zero, or the current did not show any peak but increased or decreased monotonically to reach the steady state. However, the peak appeared later than the SCLC peak time. When τ> t 0 , the current increased after t 0 due to the virtual increase of the dielectric constant with time. From the shape of experimental J - t curves for polar polymers, ranges of τ and t 0 can be determined.