of sodium (Na) sources, ie, soda-lime glass (SLG), sodium-free glass (SFG), SFG with Na-
doped Mo layers (Mo: Na), in a co-evaporation system. SIMS depth profiles for In2Se3
precursors deposited at 400° C demonstrated that the different amounts of Na diffused out of
each Na source. High-temperature XRD experiments revealed that there was no significant
effect of Na on the reaction path of CuInSe2 formation from In2Se3/CuSe stacked precursor …