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Abstract:
Thin-film solar cells with CuInxGa1-xSe2 (CIGS) absorber are still far
below their efficiency limit, although lab cells already reach 20.1%.
One important aspect is the homogeneity of the alloy. Large-scale
simulations combining Monte Carlo and density functional calculations
show that two phases coexist in thermal equilibrium below room
temperature. Only at higher temperatures, CIGS becomes more and more a
homogeneous alloy. A larger degree of inhomogeneity for Ga-rich CIGS
persists over a wide temperature range, which contributes to the
observed low efficiency of Ga-rich CIGS solar cells.
