They seem to be able select re radiation frequencies:
Something like this might work for better solar PV.
One goal would be to re radiate the IR at a frequency that the PV could use for power generation.
Another goal would be to just cool the PV. PV loses up to 20% of its efficiency in the summer heat. If it could re radiate IR and reflect the frequencies it does not use for power generation the efficiency could remain high.
Bret Cahill