Update... Alta Devices new record it's 28,9% now (since july of 2018) :
https://www.altadevices.com/alta-dev...ciency-record/
That 28,9% it's for thin solar film, and for dual junction it's 31,6% :
https://www.altadevices.com/about-overview/
The record they had in february 2018 was 25,1% for thin film and 28,8% for dual juntion.
Quite a good advance for efficince in some months.
Had they already products for on market?
What will be the estimated price per watt for their thin solar film ?