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Top: Energy band diagram of a CIGS solar cell similar to the one studied in this work. Possible losses are Shockley-Read-Hall Recombination (SRH) in the bulk and for interface recombination (IFR). Bottom: Calculated electron–hole pair generation rate within the studied CIGS solar cell from the two LED setups used in this study in comparison with the generation rate from the AM 1.5G spectrum. Note that a UV-LED is added to the IR and visible light LED.
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