Abstract

We have developed a supplementary-light method for measuring the conversion efficiency of multijunction solar cells using component reference cells with filters, which is a simple and low-cost method. Comparing the device I-V parameters measured by this method with the same parameters measured actually under the reference spectrum, that is, our reference spectrum (AM1.5 solar simulator) or the near AM1.5 reference spectrum, we found that this method is capable of determining the multijunction cell efficiency with an error of less than 2–3%, mainly due to the FF deviation. Also, we have tried to evaluate multijunction cells under a single-source solar simulator by the conventional reference-cell method and found that this method gave an uncertainty of 5–6%.

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