Spectral Correction in the Assessment of Solar Cells Efficiency: A New Method for Improving Measurement Accuracy

This brief correspondence addresses the issue of measurement accuracy in the efficiency of solar cells when using artificial light sources in laboratory conditions. Main attention is paid to the spectral correction of artificial light sources when simulating solar radiation, which is critically important for improving the accuracy of photovoltaic device testing results. The proposed method is based on equating not only the total number of electrons generated by artificial light sources and the solar spectrum, but also on their equalization for each wavelength. This approach helps minimize errors caused by spectral mismatch of different solar cell technologies. The proposed criteria and correction method are based on measurements of the external quantum efficiency (EQE) of elements and do not require the use of a special reference element, as well as allowing the determination of optimal combinations of light sources for each type of photovoltaic technology. The results of the study can serve as a basis for standardizing test procedures and a guide for further research on the improvement and certification of solar technologies.