Composite absorbing layer pyroelectric infrared detector
A pyroelectric infrared and composite absorbing layer technology, which is applied in thermoelectric devices, electric radiation detectors, thermoelectric devices with thermal changes in dielectric constant, etc., can solve the problems of complex manufacturing process and high manufacturing cost, and achieve dense coating layer, High absorption coefficient, effect of improving absorption rate
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[0024] A composite absorbing layer pyroelectric infrared detector. The absorbing layer in the infrared sensor unit has a composite layer structure, and from the top layer to the bottom layer, it includes titanium metal layer 1, dielectric layer 2, nickel-chromium alloy layer 3, lithium tantalate Crystal layer 4 and reflective layer 5;
[0025] In the present invention, a pyroelectric infrared detector sensitive element is first prepared. In this embodiment, lithium tantalate crystal is selected, and the lithium tantalate crystal material is subjected to treatments such as grinding, polishing, chemical etching and / or cleaning to obtain a lithium tantalate crystal substrate ;
[0026] The material of the reflective layer 5 can be nickel-chromium alloy, which is deposited on the bottom surface of the lithium tantalate crystal layer 4 by radio frequency magnetron sputtering; the nickel-chromium alloy layer 3 is deposited on the lithium tantalate crystal layer by radio...
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