The Three-Stage Deposition Process for Producing Cu(In,Ga)Se2 Thin Films and How Sodium Affects Their Characterization

• CJSung

  English

  Author

• Chen GC

  English

  Author

This study aims to compare Mo/SLG to Cu(In,Ga)Se2 (CIGS) thin films made using a three-stage deposition technique with a MoNa back
contact and determine the effect of sodium on their properties. Unlike CIGS deposited into Na-free substrates, which have the (220/204)
preferred orientation, all CIGS thin films placed onto Mo/SLG substrates have the (112) preferred orientation, according to the XRD data.
Because sodium has a surfactant effect that may lower the surface free energy during development, the (220/204) orientation becomes
increasingly frequent in CIGS thin films as the MoNa thickness grows. Increasing the Na concentration causes the grain size near the back
contact to shrink and the Ga gradient to become greater. Raman spectroscopy shows that, in the absence of an OVC chemical, each of the
CIGS thin films displays a single peak. 

• pdf