Skip to Main content Skip to Navigation
Journal articles

High and Temperature‐Independent Dielectric Constant Dielectrics from PVDF‐Based Terpolymer and Copolymer Blends

Résumé : Relaxor ferroelectric polymers exhibit high k at their structural phase transition around room temperature. They are particularly attractive as gate dielectric in organic field effect transistor (OFET). Nevertheless, their applications are limited due to their low thermal stability. A polymer blend system with a high and thermally stable dielectric constant is demonstrated by mixing terpolymer poly(vinylidene fluoride-trifluoroethylene-chlorofluorethylene) P(VDF-ter-TrFE-ter-CFE) with copolymer poly(vinylidene fluoride-trifluoroethylene) P(VDF-co-TrFE). PVDF-based blends of various compositions are characterized by dielectric spectroscopy, differential scanning calorimetry (DSC), infrared spectroscopy, small and wide angle X-ray scattering (SAXS and WAXS), and atomic force microscopy (AFM) in order to investigate the relationship between morphology and crystallization of the blend and their dielectric properties. An optimized blend of P(VDF-ter-TrFE-ter-CFE) [55/37/8] and P(VDF-co-TrFE) [46/54] at a ratio of 70/30 is found to exhibit a quasi-constant dielectric constant of 40 ± 2 over a wide temperature range (20–80 °C). Furthermore, electrical characteristics of the PVDF-blend-based gate dielectric OFET show further thermal stability in comparison to OFET based on high-k terpolymer P(VDF-ter-TrFE-ter-CFE) [55/37/8]. An improvement of their drain current stability by up to 60% is demonstrated at 60 °C. These findings enable broader applications of fluoropolymers in organic electronics.
Complete list of metadatas

Cited literature [40 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-02481933
Contributor : Damien Thuau <>
Submitted on : Tuesday, April 7, 2020 - 11:07:52 AM
Last modification on : Thursday, April 9, 2020 - 4:21:45 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2020-06-16

Please log in to resquest access to the document

Identifiers

Citation

Damien Thuau, Konstantinos Kallitsis, Sara Ha, François Bargain, Thibaut Soulestin, et al.. High and Temperature‐Independent Dielectric Constant Dielectrics from PVDF‐Based Terpolymer and Copolymer Blends. Advanced Electronic Materials, Wiley, 2020, 6 (3), pp.1-9. ⟨10.1002/aelm.201901250⟩. ⟨hal-02481933⟩

Share

Metrics

Record views

54