Indium zinc oxide window layer for high-efficiency Cu(In,Ga)Se2 solar cells

Current-voltage measurements under simulated sunlight of CIGS-based solar cells with IZO window proved comparable efficiencies to AZO coated reference cells. A champion cell with 21.3% efficiency was achieved for CIGS with IZO. Damp heat testing of not encapsulated mini-modules clearly demonstrated enhanced stability against humidity for IZO window layers in comparison to AZO.