Dielectric and pyroelectric properties of LiTaO3:P(VDF-TrFE) composite films

A. K. Batra; John Corda; Padmaja Guggilla; M. D. Aggarwal; M. E. Edwards

doi:10.1117/12.807948

12 February 2009 Dielectric and pyroelectric properties of LiTaO₃:P(VDF-TrFE) composite films

A. K. Batra, John Corda, Padmaja Guggilla, M. D. Aggarwal, M. E. Edwards

Proceedings Volume 7213, Organic Photonic Materials and Devices XI; 721313 (2009) https://doi.org/10.1117/12.807948
Event: SPIE OPTO: Integrated Optoelectronic Devices, 2009, San Jose, California, United States

Abstract

Pyroelectric infrared radiation detectors are one of kind thermal sensors, operating at ambient temperature, unlike semiconductor detectors, which require cooling. They also have a uniform spectral response in a wide range of wavelengths, including the main band of infrared transmission of the earth's atmosphere. Recently, 0-3 composites consisting of ferroelectric ceramic particles dispersed in a ferroelectric polymer have stimulated interest due to their good mechanical flexibility and strength, and excellent piezoelectric and pyroelectric properties. Lithium tantalite [(LiTaO₃), LT] ceramic particles have been incorporated into a polyvinylidene fluoride-trifluoroethylene [P(VDF-TrFE) 70/30 mol%] copolymer matrix to form composite films. The films were prepared using solvent casting method with the LT powder homogeneously dispersed in the P(VDF-TrFE) copolymer matrix with various volume fractions. Electrical properties such as the dielectric constant, dielectric loss, and pyroelectric coefficient have been measured as a function of temperature as well as frequency. In addition, materials' figures-of-merit have also been calculated to assess their use in infrared detectors. The results show that the fabricated lithium tantalite: polyvinylidene fluoride-trifluoroethylene composite films have a good potential for uncooled infrared sensor applications operating at moderate temperatures.

Citation Download Citation

A. K. Batra, John Corda, Padmaja Guggilla, M. D. Aggarwal, and M. E. Edwards "Dielectric and pyroelectric properties of LiTaO₃:P(VDF-TrFE) composite films", Proc. SPIE 7213, Organic Photonic Materials and Devices XI, 721313 (12 February 2009); https://doi.org/10.1117/12.807948

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