There are already 46% efficient solar cells, the 33.7% limit is for a specific type of solar cell (single p-n junction) which are cheaper to manufacture.
The maximum theoretical limit is ~86.8% for solar panels.
The maximum theoretical limit is ~86.8% for solar panels.
Most double junctions require either MOCVD or even ALD but both technologies require longer fab time, have a higher reject rate, and the machines are almost 2X as expensive. Even then, the highest I've seen for solar panel efficiency product that you can purchase is around 32% and that is "state of the art" for today.