I came across with the article on a russian website, saying they are planning to start production of solar cells using advanced semiconductor technology called "quantum heterostructure" (maybe in other words heterojunction?), allowing to increase efficiency twice at the same time reducing the production costs by almost four times.
I am not involved in semiconductor technologies, but as far as I know, this technology as a photovoltaic application (multi-junction solar cell) is used in NASA's Mars Exploration Rover mission and back in days was (actually first time) used by Soviet space mission (I do not remember which). But it was not feasible for mass production in utility scale. But maybe I am not enough informed.
Is something like that already possible? If yes, how they could do it?
P.S. I am still trying to understand what is behind this technology. If I find more info about this I will share here.