Effect of trap states and microstructure on charge carrier conduction mechanism through semicrystalline poly(vinyl alcohol) granular film. (May 2018)

• Record Type: Journal Article
• Authors: Das, A.K.; Bhowmik, R.N.; Meikap, A.K.
• Is Part Of: Solid state communications. Volume 273(2018)
• Page Start: 50
• Page End: 54
• Publication Date: 2018-05
• Subjects: A. Polymer -- D. Current voltage hysteresis -- D. Impedance spectroscopy; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2018.02.004
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We report a comprehensive study on hysteresis behaviour of current-voltage characteristic and impedance spectroscopy of granular semicrystalline poly(vinyl alcohol) (PVA) film. The charge carrier conduction mechanism and charge traps of granular PVA film by measuring and analyzing the temperature dependent current-voltage characteristic indicate a bi-stable electronic state in the film. A sharp transformation of charge carrier conduction mechanism from Poole-Frenkel emission to space charge limited current mechanism has been observed. An anomalous oscillatory behaviour of current has been observed due to electric pulse effect on the molecular chain of the polymer. Effect of microstructure on charge transport mechanism has been investigated from impedance spectroscopy analysis. An equivalent circuit model has been proposed to explain the result. Graphical abstract: The effect of trap states, molecular chain and microstructure on carrier conduction mechanism through PVA film. Highlights: The PVA granular film is formed. The film exhibited a good hysteresis loop at room temperature. Carrier conduction is described by temperature dependent I-V characteristics. The impedance spectroscopy is explained by an equivalent circuit model.