Abstract
ABSTRACT BaSrTiO3 (BST) thin films with a nominal composition of Ba0.60Sr0.40TiO3 and BST thin films doped with magnesium, aluminum, lanthanum and tantalum (0–20.0 mol% for Mg and 1.0 mol% for the Al, La and Ta dopants) were synthesized via the metalorganic solution deposition (MOSD) technique in order to investigate their potential for use as the active material in uncooled infrared (IR) detector applications. The films were characterized for structural, microstructural, compositional, surface morphological, dielectric and insulating properties. The Materials Detectivity Figure of Merit (FOM), D*, [D* = pi /(C V (ϵ0ϵrtan δ)1/2] was used to evaluate the film's detectivity response. Our results suggest that undoped Ba60Sr40TiO3, with a value of D* = 0.08 (cm3/J)1/2, appears to out perform Pb based pyroelectric thin films, thus making it a viable candidate for IR pyroelectric detector applications. In addition the preliminary dielectric response studies of the 5 mol% Mg doped BST and 1 mol% La doped BST thin films indicate that these two materials are also excellent potential IR material candidates.
Published Version
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