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EFFCIS II: High-efficiency CIGS solar cells through improvement of functional layers and interfaces.

In order to make thin-film solar modules based on Cu(In,Ga)Se2 technology even more economically attractive, fundamental physicochemical issues are being scientifically investigated in the EFFCIS-II joint project. In the research network, which is funded by the BMWi, experts from research institutions, universities and industry are working together to increase the efficiency of CIGS cells through novel passivation layers and modified absorber material.

EFFCIS-II takes the results of the predecessor project EFFCIS and derives new research approaches from them: optimization of the CIGS volume properties, increase of the CIGS bandgap energy with additional chemical elements, reduction of the CIGS layer thickness as well as bilateral interfacial passivation at the CIGS front and back side. This combination of new approaches and evolutionary optimizations suggests a significant jump in module efficiency at reduced cost.

Highly spatially and temporally resolved methods such as atom probe tomography and transmission electron microscopy are used in a correlative manner to characterize the absorber and associated interfaces.