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IJPAP Vol.43(03) [March 2005] >


Title: Electrical transport in solution-grown thin films of polyvinylidene fluoride
Authors: Sahu, Devendra K
Khare, P K
Srivastava, R K
Keywords: Transient currents
Steady state conduction
Polyvinylidene isothermal immersion technique
Dipolar orientation
Space charge
Issue Date: Mar-2005
Publisher: CSIR
IPC CodeH01C17/065
Abstract: The mechanism of electrical conduction in polyvinylidene fluoride (PVDF) films sandwiched between similar and dissimilar electrodes has been investigated in both transient and steady state conduction modes. The thin films are of 20m thick and obtained by the isothermal immersion technique. The conduction process is examined in a temperature range 40-80°C, with applied dc electric fields ranging from 10 to 100 kV/cm using both types of similar and dissimilar electrodes systems. The nature of transient currents has mainly been attributed to the dipolar nature in the lower temperature region where slope value m is found to vary from 0.43 to 0.62 for similar electrode system and from 0.78 to 0.98 for dissimilar electrode combinations. The steady state conduction current has been found to be strongly temperature dependent. The current-voltage characteristics show two regions of conduction: ohmic conduction with a slope of curve 0.48 to 0.68 at lower and non‑ohmic conduction with a slope 1.87 to 2.05 at higher fields. These results have been interpreted in the light of Richardson-Schottky alongwith space charge limited (SCL) conduction transport mechanism.
Page(s): 207-214
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(03) [March 2005]

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