New progress in research on new photothermal detectors from Dalian Institute of Chemical Physics
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[ China Instrument Network Instrument Development ] Recently, the Dalian Institute of Chemical Physics Jiang Peng researcher, Bao Xin and academician team made new progress in the development of new photothermal detectors, and the related results were published in Nature Communications.
A photothermal detector is a detector based on two basic energy conversion processes of photothermal conversion and thermoelectric conversion. When light is irradiated at one end of the thermoelectric material, the light energy is first converted into thermal energy by photothermal conversion, thereby establishing a temperature difference (ΔT) across the thermoelectric material. Driven by the temperature difference, the carriers will diffuse toward the cold end (ie, the Seebeck effect in the thermoelectric conversion), thereby establishing a potential difference across the material. Photothermal electric detectors have the advantages of self-power supply, non-refrigeration, wide response wavelength range, etc., and have important application prospects in military and civilian fields such as light detection, infrared thermal imaging, and temperature monitoring.
The responsiveness of the photothermal detector is proportional to the Seebeck coefficient (S) of the material and ΔT across the material. Conventional photothermal detectors use conventional thermoelectric materials with a low Seebeck coefficient (usually less than 200μV/K), such as Bi2Te3, Sb2Te3, etc. In order to improve the responsiveness, it is usually necessary to use a micromachining process to construct the array structure, which significantly increases the number of The complexity of the manufacturing process increases the cost of the product. The research team broke through the limitations of the traditional thermoelectric material system, using strontium titanate (SrTiO3) with a higher room temperature Seebeck coefficient (about 1000μV / K), and phonon absorption in the long-wave infrared atmospheric window (8 ~ 14μm) by means of SrTiO3 To enhance the efficiency of photothermal conversion. Combining these two advantages, a single SrTiO3 photothermographic element has a responsivity of 1.2 V/W around a wavelength of 10 μm. Further research shows that the response wavelength of SrTiO3 photothermometer can extend from deep ultraviolet to far infrared, and can withstand optical power density of 103W/cm2.
This research provides a new way of thinking for the development of new high performance photothermal detectors. In addition, compared with the traditional photothermal detectors, SrTiO3 photothermal detectors are cheap, environmentally friendly, high temperature resistant, excellent device performance and simple preparation process, which means that SrTiO3 photothermometers have broad practical application value.
The above research work has been funded by the National Key R&D Program and the Dalian Chemical Industry Innovation Fund.
(Original title: New progress in research on new photothermal detectors from Dalian Institute of Chemical Physics)