Low cost and anti-noise infrared device based on saw-tooth thermal isolation structure

•We remove the resistor Rg of the infrared device based on composite film to reduce the cost.•We proposed a saw-tooth thermal isolation structure.•The saw-tooth thermal isolation structure has good thermal insulation performance and good anti-noise performance.•Our device has excellent electro properties, such as Rv, NEP and D*.

The low cost composite film pyroelectric infrared device with novel saw-tooth thermal isolation structure is reported in this paper. The pyroelectric sensor was fabricated by using PZT/P(VDF-TrFE) composites. The Rg of the voltage-mode readout-circuit was removed to reduce the cost. Use PCB V-cut process to fabricate saw-tooth thermal isolation structure to improve anti-noise performance of the device. The device that using improved readout-circuit and saw-tooth thermal isolation structure was prepared. The voltage responsivity (Rv), noise equivalent power (NEP) and detectivity (D*) of the device were calculated, the modulation frequency was 2.3 Hz-117.3 Hz.