FallstarScientists invent double-sided solar panel that generates vastly more electricity
tinwhiskersTLDR; the front side is 23% efficient, and the rear side 20% efficient.
They don't actually give an overall efficiency but it implies a total of 43%. They compare this to typical panels also at 23% efficient, so it's really remarkable if true. Other emerging solar tech is up to about 32% but if that could also benefit from multiple layers then total efficiency could become insane.
Seems a little too good to be true, really, but great if so.
I don’t think you can just add up efficiency percentages like that…
They say the second layer retains 93% of the performance of the first using reflected light, making it 20% efficient, so, yes they are added in that case.