Enhanced ferroelectric properties of P(VDF-TrFE) thin film on single-layer graphene simply adjusted by crystallization condition

Abstract

Ferroelectric polymer/graphene hybrid systems have received considerable attention due to their promising utilization in flexible electronics. The crystallization of ferroelectric polymers such as poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) can obviously affect the electronic properties of the hybrid systems. Here, the effects of thermal treatment temperature and crystallization temperature on the structure, morphology, and piezoelectric/ferroelectric properties of P(VDF-TrFE) on graphene substrate are reported. Moreover, the dependence of coercive voltage and piezoelectric coefficient (d33) on thermal treatment temperature or crystallization temperature is explored. It is identified that coercive voltage is only relying on the crystallization temperature other than thermal treatment temperature. Once crystallization temperature changes, both coercive voltage and d33 alter significantly and an optimum crystallization temperature exists at which the sample shows the best properties. The relationship between structure and piezoelectric/ferroelectric properties is built. These findings provide useful guidance for fabricating piezoelectric/ferroelectric P(VDF-TrFE)/graphene devices with high performance.