A new success has been achieved in the field of flexible solar cells: a team of Swiss scientists has produced solar cells that have a record efficiency of 21.4%. The research was conducted at the Swiss Federal Laboratories for Materials Science and Technology (Empa), where scientists over the years have developed flexible solar cells known as CIGS, a technology based on copper indium gallium diselenide (Cu(In,Ga)Se2), a composite semiconductor material that allows the production of flexible and lightweight solar cells on polymer film. To make these new cells, scientists used a technique called low-temperature co-evaporation, which deposits a very thin layer of semiconductor materials on a thin polymer film. By modifying the composition of the film and the alkaline dopants used to endow it with electrical properties, the team was able to increase its photovoltaic performance.
Celle solari flessibili CIGS: Crediti: Empa
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