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The evolution of solar cell technology and the introduction of new cell concepts,e.g.PERC,IBC or n-type cell designs,raise major questions on the applicability of established testing methods for solar cell characterization.Significant differences in temporal and spectral response require study of the effects of different test procedures and test setup on device performance.We have carried out experiments and simulations to predict and determine the measurement artifacts of different quality of illumination for different cell types.Spectral classification of the light sources ranges from class C to class A+.Cell currents under these conditions are compared to values for AM1.5G illumination for multi crystalline p-type cells,mono-crystalline p-type cells,and n-type cells.Results show that relative deviation can be reduced to<1% by appropriate match of illumination.Effects of enhanced sensitivity in the long wavelength range are also discussed.To determine temporal effects within flash illumination a series of measurements has been performed.First,stability of the illumination spectrum has been studied for flash pulses with up to 1OOms duration.Spectra were recorded at different times during the flash.Results show an excellent stability of spectral classification over time.Temporal response of different types of solar cells has been studied by varying the Ⅳ characterization interval within the flash.In these experiments data acquisition period range from 2 ms to 100 ms and measurements have been delayed up to 80 ms after the start of light pulse.