What Is the Most Appropriate and Practical Index to Represent Spectrum Sensitivity of CPV?

Different from crystalline silicon solar cells, CPV using III-V multi-junction cells does not receive great influences from temperature, rather receives from solar spectrum. Some rating values related to spectrum sensitivity are needed both for the label of modules and the energy rating. Generally, an accurate model needs measurement of many parameters, which is not always accurate and requires complicated calculations. First, input parameter should be common and easy to measure. This simplicity is important for repeatability among manufactures and testing labs. Second, input parameter is not vector but scalar value. In this regards, data set from direct solar spectrum is not appropriate. Third, output parameter that describes spectrum sensitivity is a single value. The method proposed by this paper is energy or capacity factor is expressed by quadric function of DNI.