Ca Substituted PbTiO 3 Thin Films for Infrared Detectors

Crack free Ca substituted PT thin films have been deposited on ITO coated 7059 glass substrates by sol gel technique and crystallized at 650∘C. Characterization of these films by X-ray diffraction show that the films exhibit tetragonal structure with perovskite phase. AFM, hysteresis, dielectric relaxation and pyroelectric studies have been carried out. The pyroelectric figures of merit of the films have been calculated. Our investigations show that these films are expected to give high infrared detector performance due to its high pyroelectric coefficient (∼43 nC/cm 2 K), high voltage responsivity (∼2340 Vcm 2 /J) and detectivity(∼3 × 10 − 5 Pa − 1/2 ) along with small value of dielectric constant (∼83) and loss tangent (∼0.04).