Matching of Silicon Thin-Film Tandem Solar Cells for Maximum Power Output

Figure 7

The converted power was determined in 𝐽𝑉 measurements under the sun simulator illumination applying additional LED illumination. The reference tandem solar cell was measured under an attenuated sun simulator spectrum (filled blue symbols) and under a noncalibrated illumination (open blue symbols). The device under test was characterized under the same test spectra (open cyan symbols). The measurement number 𝑛 labels the different steps in additional LED bias illumination. We show 11 steps for the experiment, 21 in the calibration. The red star marks the illumination conditions closest to AM1.5g.