Lead-free pyroelectric infrared detector based on (Bi1/2Na1/2)TiO3-BaTiO3 ferroelectric ceramics

In this paper, we theoretically and experimentally reported a lead-free pyroelectric infrared (PIR) detector using (Bi1/2Na1/2TiO3)-BaTiO3(BNT-BT) ferroelectric ceramics as the sensitive material. The variation of noise density, voltage response rate (R-V), and specific detection rate (D*) with the modulation frequency under the current mode amplification circuit was investigated, and it was found that the lead-free PIR detector showed high R-V in the low frequency band. The R-V and D* reached 1.51 x 10(5) V/W and 2.02 x 10(8) cmHz(1/2)W(-1) at 10 Hz, respectively. The results were much superior to the PIR based on traditional commercial pyroelectric ceramics, indicating that BNT-BT lead-free ceramics have great potential in application to PIR detectors.