Structural, microstructural, and ferroelectric studies of polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) thin films in Ag/Cu/PVDF‐HFP/Cu capacitor structures. Issue 21 (26th January 2022)

• Record Type: Journal Article
• Authors: Roy, Jyotirmoy; Chikkonda, Raghavendar; Kishor, Gara; Thankamani Sathyanathan, Akhil Raman; Raju, K. C. James; Gangineni, Ramesh Babu
• Is Part Of: Journal of applied polymer science. Volume 139:Issue 21(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-26
• Subjects: copolymers -- dielectric properties -- films -- surfaces and interfaces -- X‐ray; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.52187
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: In this article, the structural, microstructural, and ferroelectric characteristics of polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) thin films in Ag/Cu/PVDF‐HFP/Cu capacitor structures have been investigated. The bottom interfaces glass or Cu/glass influence upon the PVDF‐HFP thin‐film crystal structure and microstructure have been evaluated using grazing incidence X‐ray diffractometer and atomic force microscopy. Quasi‐static current–voltage loops, the polarization versus electric field loops measured at varied applied frequencies (100 mHz–1 Hz) and electric field amplitudes (2.5–27.5 MV/m) are utilized to comprehend the ferroelectric characteristics of PVDF‐HFP thin films. Furthermore, the observed linear dependency between coercive field and frequency is linked to the homogenous domain growth model proposed by Kolmogorov‐Avrami‐Ishibashi. Abstract : Organic fluoro‐polymers are known for their functional ferro‐, piezo‐ and pyro‐ electric natures. The economical production of these functional thin films draws them for low‐frequency flexible memory and sensing devices. In this work, the structural, microstructural and ferroelectric properties of polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) co‐polymer thin films in Ag/Cu/PVDF‐HFP/Cu capacitor structures have been exemplified. Further, the observation of homogenous domain growth is established from the relation between electric coercive field and frequency of the applied signal.