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Published online by Cambridge University Press: 27 June 2011
We present a procedure for calibrating tandem thin film photovoltaic modules under natural sunlight. The distinct steps involve pre-conditioning via light soaking, spectral response measurements and I-V measurements under natural sunlight. The measurements were done using a crystalline silicon reference cell as well as two filtered reference cells designed to spectrally match the top and bottom junctions in the tandem module.