WindyOne;
Please go read some of Oz's previous posts, he kinda knows what he's talking about.
He's always up for a good civilized discussion, but if you don't know what you're talking about down the the science level then re-read even more.
WHAT he's trying to say and as I read it>> the info doesn't add up you can't get something for nothing, you can get more efficient by going after the wavelengths and then stacking,BUT...
This was the approach MIT, CALTECH was pursuing was doping for specific wavelengths then stack the panels as the other wavelengths would be invisible to the previous panel.
See, what the current PV do is a broadband approach to solar, to get more PV out of a given space, then the manufacturers will need to get into the specific wavelength regions and harvest from those.
THIS really isn't new, Electronics Weekly wrote about it way back in the early 80s, so what (I THINK) OZ was saying about shotty reporting was the writer didn't seem to do his/her homework on the history or rather went into hyper-Media mode to pump up a story.
AND Solar heat tubes ARE supposed to absorb solar rads if they didn't they wouldn't be doing their jobs
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Cheers;
Bruce S