Investigation of intergrain compounds in sputtered Mo films applied in CuIn1 − xGaxSe2-based solar cell

► Sputtered Mo thin film as tuner for the sodium availability during CuIn1 − xGaxSe2 growth. ► Increase of amorphous phase content between the Mo columns with argon pressure. ► Comparison of low loss EELS in the intergrain zones of Mo film to reference spectra. ► Sodium within the intergrain areas in sodium molybdate form and intercalated in MoO3.