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3. Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells
4. Effects of heavy alkali elements in Cu(In,Ga)Se
2
solar cells with efficiencies up to 22.6%
5. Cd-Free Cu(In,Ga)(Se,S)2 Thin-Film Solar Cell With Record Efficiency of 23.35%