Modeling the effect of varying spectra on multi junction A-SI solar cells

The performance of multijunction amorphous silicon cells has been investigated for outdoor solar spectral radiation, using long term measurement for existing data at CREST, Loughborough University. It is a further study of the solar system, destined to analyze the outdoor performance of the amorphous silicon cells. The short circuit current for each subcells have been modeled and implemented into a computer program to calculate the mismatched short circuit current of the whole device.

Top Subcell Bottom Subcell 0.5 0.6 0.7 0.8 Useful Fraction 0.9 0.8 Triple Junction Top Subcell Middle Subcell Bottom Subcell 0.75 0.7 0.65 0.6 0.6 0.7 0.8 0.9 Useful Fraction 1.1 Fig. 8. The influence of the UF on the FF.