[All Darc]

I notice that solar cell production cost (not counting wholesalle and retailers and taxes) it's already very low to solar cells itself, even the semi flexible 21% or 22% efficience solar cells.

The problem it's the solar panel structure, the metal plates, the strong glass sheet, the supports to prace on roof, that make it pricy.

For example, in ALibaba, some sellers offer a 3,34W Sunpower solar cell (semi flexible) for just 0,5 dollar the unit, if the buyer take a very huge number.
This is just 0,15 dollars per watt. And there is also the profit of the seller (probably connected with factory).

So I don't see much more can be done in solar cell cost reduction to impact in the solar energy cost. Now they need to find better and less expensive ways to built the panels, the supports structure...

If efficience was quite higher the number of panels required would be reduced. But each time a great new cell arrive it took many years to the price get low as the old cell.