Abstract
This paper aims at improving the performance of the poly(vinylidene fluoride-trifluoroethylene)[P(VDF-TrFE)] copolymer for pyroelectric infrared detection and direct thermal toelectrical energy conversion. Three different types of samples were prepared and examined:commercial, purified and porous films. Here, full characterization of the thermophysical andelectrical properties relevant to pyroelectric infrared detection and energy conversion ofboth purified and porous P(VDF-TrFE) thin films is presented. Properties measuredinclude (1) density, (2) ferroelectric to paraelectric phase transition temperature, (3)enthalpy of change of phase, (4) electrical resistivity and (5) ferroelectric hysteresis, as wellas (6) specific heat, (7) dielectric constant, (8) loss tangent and (9) pyroelectriccoefficient as a function of temperature. The figures of merit for infrared detectionFV,FI andFD were improved by 47.0, 59.6 and 51.6%, respectively, for the purified filmswhile the porous films with a porosity of 33% showed an improvement of 52.8,66.3 and 62.6%, respectively, when compared to those of dense commercialP(VDF-TrFE) films. In addition, figures of merit for energy harvesting,FE andk2, indicate that the purified and porous films are attractive for thermal to electrical energyconversion as well.
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