Thin-film photovoltaics (TFPVs) are being developed as a lower-cost alternative to silicon-wafer-based products. The three main categories of TFPVs are named after their active-layer components: thin silicon, II-VI (primarily CdTe), and CIGS (copper indium gallium disulfide.) Each exists as an active layer on top of a transparent conductive oxide (TCO) on top of a substrate (usually glass or metal.) 

typical Coatings:

TCO’s – ITO, ZnO2 usw

AR Coatings

Active layers ( Si am, CDS, CdTe, CIGS)

Photoresist