Study of self-calibrating photodiodes for trap detectors

In accordance with the stated purpose of the study, the measurements and analysis of photodiodes were carried out, and the best alternative for the development of the trap detector was chosen. The paper substantiates the necessity for an alternative to the absolute cryogenic radiometer because of its highly expensive measurements. The need for more accurate measurement data has determined the use of trap detectors, including self-calibrating photodiodes. Such trap detectors can be used independently, without calibration by an absolute cryogenic radiometer. Thus, the cost of the study is reduced. Besides, the given approach does not affect the accuracy of the obtained measurement results. When reviewing modern approaches to the use of the above-mentioned trap detectors, it was discovered that trap detectors, together with self-calibrating photodiodes, are widely used both in state measurements of photometric quantities and for laboratory needs in many developed countries worldwide. The given analysis allows us to assert that the issues of developing, studying, and using new trap detectors, considering a significant advantage in their characteristics in comparison with the previously developed ones, make up an urgent scientific task. The paper defines selection criteria based on certain characteristics of photodiodes. When investigating the operating spectral range of the selected photodiodes, their internal quantum efficiency, geometrical dimensions of the receiving element of the selected photodiodes, and the coefficient of mirror and diffuse reflection of the receiving surface of the selected photodiodes, measurement results for all the stated characteristics were obtained. Based on these values, a screening of the photodiodes that do not meet the requirements for photodiodes specified for the development of the trap detector was made. Based on experimental studies, photodiodes S1337-1010BQ were selected.