Progress in the measurement of multi-junction devices at ISE [solar cell testing]

A reference solar cell method with software preselection of the simulator setting is discussed. This method has a high potential for reducing measurement time. The authors report the progress in setting up a triple source simulator for large-area solar cells with an in situ measurement of the spectrum using a calibrated spectroradiometer from 350 nm to 1500 nm. They present details of their high-precision spectral response facility for solar cells of up to 10×10 cm² over a wavelength range of 320 nm to 1500 nm. An analysis is made of the propagation of systematic spectral uncertainties: typically a 10% spectral uncertainty leads to a 1.5% uncertainty in short-circuit current when the spectral mismatch method is used