Abstract
Bilayer coatings of barium strontium titanate (BaxSr(1−x)TiO3)/poly [(vinylidenefluoride-co-trifluoroethylene] (PVDF-TrFE) were integrated on silicon Si (100) for pyroelectric devices. Pyroelectric properties of the composite were determined for different electrode materials (silver and aluminum) and different electrodes configurations creating an electric field in parallel and in-plane direction in the ferroelectric coating. For this purpose, parallel-plate and planar interdigital capacitors were fabricated. Anisotropy in the pyroelectric response was noted for the different directions of the measured electrical potential. The dynamic method was used to evaluate the pyroelectric properties in the temperature range of 22 to 48 °C. Pyroelectric response with a higher value was observed at the one plate’s configuration of interdigital electrodes. The voltage response was the strongest when silver contacts were used. At temperatures near room temperature, the voltage increased by 182 µV at resolution of 7 µV/°C for the in-plain device configuration, vs. 290 µV at a resolution of 11 µV/°C for the out-of-plain configuration. A relationship between the surface morphology of the ferroelectric oxide and oxide/polymer coating and the pyroelectric voltage was also found, proving the smoothening effect of the introduction of polymer PVDF-TrFE over the BaSrTiO3 grains.
Highlights
Among the interesting properties of the perovskite oxides are their ferroelectric, piezoelectric and pyroelectric ability
I(nFicgounrtera4sct),. the BST/PVDF-TrFE exhibited enhanced pyroelectric voltage due to the presence of pyro- and piezoelectric polymer in the films composition, which contributes to the ferroelectric oxide surface smoothening and strengthening the charge collection ability of the contacts
The BST/PVDF-TrFE exhibited enhanced pyroelectric voltage due to the presence of pyro- and piezoelectric polymer in the films composition, which contributes to the ferroelectric oxide surface smoothening and strengthening the charge collection ability of the contacts
Summary
Among the interesting properties of the perovskite oxides are their ferroelectric, piezoelectric and pyroelectric ability These are especially important for the implementation of the materials in multisensors for simultaneous detection of pressure and temperature variation. Some of the ferroelectric materials consist of sharp-shaped grains irregularly distributed in size [5] that affect the charge carriers’ transport, causing their scattering. For this reason, additional coating could be deposited, preferably from solution, to make the surface smoother. When the material for the new coating is in liquid phase, it leaks in between the grains during film deposition, and lead to the formation of a high-density monolithic layer, consisting of composition with multiple polymer-oxide interfaces. The functional properties of the sensing structure are correlated with the contact type and configuration
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