Boy, did you ever miss the point of the article at the time it was written. It is amazing the level of performance achieved with the availability of materials at the time. I can only imagine the level of performance utilizing QMC "PQD's" .

Quote:

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Tandem cells made of two perovskite layers with ideal bandgaps have a theoretical efficiency limit of 45% and a practical limit of 35%
Levels exceeding the practical limit might just now be achieved.

Regards

Sunny:>))

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