Abstract
Recent experiments show that strontium titanate (STO) can be a very good thermoelectric photodetector and has very high photoconductivity under the illumination of UV light. By using a simple theoretical model based on the Boltzmann transport equation (BTE) photothermoelectric properties of STO are investigated in this article employing the photocarriers concentration same as doping effect. An enhancement in electrical conductivity from 0.350 S/m to 222 S/m is obtained at 300 K with ∼ 70% agreement with the experiment. In power factor, about 182 times (0.43 μWm−1K−2 to 78.3 μWm−1K−2) enhancement is observed after UV illumination. A strong role of Ti atoms is observed in electron–phonon scattering and different scattering mechanisms have dominance at different carrier concentrations. This mechanistic understanding will be helpful for designing photodetectors based on photothermoelectric (PTE) effect.
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