Looks like they use a form of the sputtering technique


Which despite it's now lower cost is probably already obsolete, due to this process:


Nanosolar already has $100 million in funding and plans for a plant capable of producing 430 megawatts per year.

Robert Nelson wrote:
09/05/06 - Update on South African Photovoltaics
“In a scientific breakthrough that has stunned the world, a team of South 
African scientists, led by Professor Vivian Alberts, has developed a 
revolutionary new, highly efficient solar power technology�

The patent # (available in pdf from espacenet.com) is:


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