State Key Laboratory of New Ceramics and Fine Processing;
School of Materials Science and Engineering;
Tsinghua University;
Beijing 100084;
China;
Key Laboratory of Radiation Beam Technology and Material Modification(MOE);
College of Nuclear Science and Technology;
Beijing Normal University;
Beijing 100875;
China;
Key Laboratory of Advanced Materials(MOE);
School of Materials Science and Engineering;
Tsinghua University;
Beijing 100084;
Chinaa;
Cu(In; Ga)Se_(2)(CIGS); Solar cells; Post-deposition treatment(PDT); Alkali effects;