Pyroelectric Properties of Sol-Gel Derived Lanthanum Modified Lead Titanate Thin Films

Abstract

Lanthanum-modified lead titanate (PLT) thin films were fabricated on Pt/Ti/SiO2/Si substrate using the sol-gel method and rapid thermal annealing technique. The pyroelectric coefficient, and the infrared responsivity and the detectivity of the films were measured using static and dynamic methods, respectively. The ferroelectric properties were also measured. The pyroelectric coefficient increased from 1.3 to 2.5 nC/cm2· K with increasing La content. However, these low coefficients of PLT films are due to their crystal quality and orientations. The infrared response properties of PLT films depended on their thermal time constants. τ t (thermal time constant) for the PLT films decreased with the La contents increasing. The effects of back surface etching on the responsivity and the detectivity were also discussed.

Dielectric and pyroelectric properties of thin film PZT

“…Significant effort has been directed at Pb-based perovskites (PLZT) because film properties can be manipulated by controlling the composition of the films. Pyroelectric effects have been reported for films made by a number of thin film techniques, including spin-on [3,4], sputtering , and ion-beam deposition [8]. Chemical vapor deposition is widely acknowledged as a desirable process for manufacturing because of the ability to scale the process to large areas with good uniformity, high deposition rate, and the ability to produce conformal coatings.…”

Fatigue characteristic and pyroelectric properties of highly (111)-oriented Nb doped Pb(Zr0.2,Ti0.8)O3 thin films with Pb0.8La0.1Ca0.1Ti0.975O3 seed layer prepared by a sol–gel route

“…[1,2]. Pyroelectric applications of these thin films that have been commercialized or demonstrated to date include thermal imaging and gas detection [3].…”

Effects of Membrane Thickness on the Pyroelectric Properties of LiTaO3 Thin Film IR Detectors

“…11) Consequently, the performance of the pyroelectric IR detector can be further improved by thermal isolation from its substrate through the lowering of heat capacity by etching the back of the Si substrate, so that the induced pyroelectric current can respond fully to the incident IR light. 12) In this study, LiTaO 3 thin films were prepared on Pt(111)/ Ti/SiO 2 /Si(100) substrates by the diol-based sol-gel method, and IR detectors with various membrane thicknesses (d), controlled by the anisotropic etching technique, were fabricated. 13,14) The influence of membrane thickness on the pyroelectric properties of thin film detectors was investigated, and the voltage responsivity (R v ), noise voltage (V n ) and specific detectivity (D Ã ) of detectors were measured using a dynamic analysis system.…”