The "absolutre efficiency" limit has been moved before.used to be 17% tripple junction and other exotic panels have been getting up to 50%+- efficiency, but the standerdised efficiency limit of 33% conversion of solar energy is for single junction conventional panels. Suggestion here is for 45% +- conversion of solar to electricity, so 450w/m², 20m²/18kw, and of course as this is capturing infrared energy, there would be residual generation at night. The demand from aerospace will drive earlier development, but as there will be other solutions, not that there are results, research happening everywhere will shift. edit: has shifted