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Robust Polarization Stability in a Self‐Assembled Ultrathin Organic Ferroelectric Nano Lamellae
Author(s) -
Viswanath Pamarti,
De Silva K. Kanishka H.,
Morikuni Yuki,
Yoshimura Masamichi
Publication year - 2021
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.202001085
Subject(s) - materials science , ferroelectricity , polarization (electrochemistry) , piezoelectricity , piezoresponse force microscopy , graphene , monolayer , nanotechnology , optoelectronics , nanoscopic scale , oxide , dielectric , composite material , chemistry , metallurgy
Spontaneous polarization is a characteristic feature of a ferroelectric material that can be switched by the application of an external electric field. However, in a practical scenario, the switched polarization should be stable for the realization of functional devices. In this study, an ultrathin (≈40 nm) poly(vinylidene fluoride‐trifluoroethylene (PVDF‐TrFE) film self‐assembled on a monolayer (≈1 nm) graphene oxide (GO) film is exploited. Oxygen‐functional groups and defective structure of GO can act as domain pinning sites to provide strong ferroelectric domain stability along with a specific crystal orientation to PVDF‐TrFE through hydrogen bonds and columbic interactions. Scanning probe microscopy based switching experiments reveal excellent piezoelectric response ( d 33 = −145 pm V −1 ) along with high polarization retention (over 1500 h with no volatilization) in these ultrathin films, paving new pathways toward high performance miniaturized organic ferroelectric devices.