Abstract
<jats:p>The possibility of creating a single-photon detector sensor with a molybdenum absorber and heat sink, lanthanum-cerium hexoboride as the thermoelectric layer, and a sapphire dielectric substrate is considered. Using computer modeling, the absorption of single photons with energies of 0.8, 1.65, and 3.1 eV in a sensor with a surface area of 1 and 0.25 μm2 at an operating temperature of 0.5 and 0.8 K is studied. The results of both heat propagation in a threelayer sensor and determination of the signal power, equivalent noise power, and signal-to-noise ratio are presented. The temporal dependences of the temperature in different areas of the sensor and the average surface temperature of the layers are studied. The maximum temperature, the time to reach the maximum, the time of temperature decay to the background level, and the characteristics of the temperature gradient at the boundaries of the thermoelectric layer are determined. Systematization of the obtained data made it possible to determine the optimal sensor design for efficient registration of single photons from the near infrared to ultraviolet spectral region.</jats:p>