Abstract
Different noise mechanisms between Mn-doped Pb(Mg1/3Nb2/3)O3–0.27PbTiO3 (Mn-PMNT) and LiTaO3 (LT) based pyroelectric infrared detectors were observed under voltage mode, revealing that at low frequency of 10Hz, dielectric loss noise dominates for Mn-PMNT based detectors, while resistance noise for LT based ones. Meanwhile, an extremely low equivalent voltage noise of appropriate 20nV/Hz1/2 was obtained in Mn-PMNT based detectors, 1/4 times lower than that of the LT based detectors. On the basis of the different noise mechanisms, frequency dependence of figure of merit for detectivity (Fd) have been deduced, providing significant reference values for the analysis of different materials based pyroelectric detectors.
Published Version
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