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NREL efficiency chart: excerpt
The excerpt from NREL's cell efficiency chart shows the 20.4% record for CIGS set by EMPA in Switzerland (filled green circles), and the much lower conversion efficiencies associated with abundant-element CZTSe-type devices (red diamonds). However, by producing multi-junction devices using two such absorber layers, it could be possible to reach the 20% efficiency mark with the alternative approach. Credit: NREL.
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